Document text
APPLICATION NOTE
Low voltage FM stereo radio
with TEA5767/68
AN10133
Philips Semiconductors
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
Abstract
This document describes an application in which the FM stereo radio ТЕА 5767/68 is being used. This new
generation single-chip stereo radio 1s alignment free. Because of its low power consumption, small size and
small FM application, this tuner will lead to a breakthrough in the market of portable consumer products, as
mobile phone, CD and MP3 players.
The radio can tune into the European, Japan and US FM bands.
© Philips Electronics М.У. 2003
АП rights are reserved. Reproduction in whole or in part 1s prohibited without the prior written consent of the copyright
owner.
The information presented in this document does not form part of any quotation or contract, 18 believed to be accurate and
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 и е
APPLICATION NOTE
Low voltage FM stereo radio
with TEA5767/68
АМ10133
Author(s):
M Ait Moulay
Philips Semiconductors Strategic Partnership Catena
The Netherlands
Keywords
TEA5767/68
FM-stereo Radio
Low voltage
Date: 18-06-2002
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
Summary
The TEA5767/68 is a single chip stereo FM receiver. This new generation low voltage FM radio has a fully
integrated IF-selectivity and demodulation. The IC does not require any alignment, which makes the use of
bulky and expensive external components unnecessary.
The digital tuning 18 based on the conventional PLL concept. Via software, the radio can be tuned into the
European, Japan or US FM band.
The power consumption of the tuner is low. The current is about 13mA and the supply voltage can be varied
between 2.5 and 5V.
The radio can find its application in many areas especially portable applications as mobile phones, CD and MP3
players.
This application note describes this FM radio in a small size and low voltage application. To demonstrate the
operation of the tuners a demoboard is developed, which can be extended with a software controllable amplifier
and a RDS chip. The whole application can be controlled from a PC by means of demo software.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
AN10133
CONTENTS
1 INTRODUCTION er 9
2. SYSTEM GLOBAL. VIEW ло feces ce ccu uoti cenae: Ro тоа па dye nude te tewecedesveseicenweciaceseaeduedslaasasts 10
241 де ыт с эл а enon ТКТ КО Г а 10
2:22EM: STEREO application «e tete ta e b НИ eked a ee eee 11
2:3 TLEAS767HN.package?.. ee ER RI eR En ERI ERA E 12
3. ТНЕ TEAS 767 p, ED 14
3. Low Мове А тор Него ша нөх e ope eir etit ob candi dae nb tele RG аны ан Rien 14
32 MIKE КА аван 15
3:3: TE:SelecttVIty: icto ret tot ie Oe eR RR RE Ue ha eek Phe noie M ipo deba eee 15
3:4. тег i. ope erede RN HE TER еи RR аға 15
3.5" Demodulatót.:32 и diano piment e Ibn e eati uo meta и 15
3:6. Тһе MPX decoder со is e e e OR RU D e TET HG RE OUR E ETE ОРЕН ЫТЫ 16
3:6, 1 The PEE; а CRM et e e RU EH Me nre e D Oe dU TI tous es 16
3:6:2-ТһерПогавесосисооциаовеитиенмииы ма c NR rei ee v be e REA 16
3:6:3- Tie SING techo phi CO Br oe nien tier c nein гене tide aive 16
3.6.4 The-matrix decoder... ied eee dee e RR eR Ee E ec cds 17
316: 92 HG aie oci A А EORR RUE ee d ЛК ООО ОУ Г СУ 17
3:7 The sofímüte:..:: «ecu tee e PH TAE e E RUE REED EE Ee дыры 18
4: "THE TUNING SYSTEM... И А 20
4.1. The: РА Шта System; «tse REN DERE а 20
4:2 PEE: word calculation eR RI RR RE RIA RN AI 21
4:2: ]'High:sideanjection tuning .. x а ee ER e e mI o nte da 21
4.22: Low sidemjection tuning; eene I eee Пси пазе Ел iei шалган 23
A Boulder 23
AA У тк сб К M 25
4:5 "Tunmng-Algorithim:;;...: oae dee eR delle eig Suc ede i e a ЫЫ 27
4:5. ]-Preset ое аным ананы tae tw iue e pe i te sitse te te aii use vd ces 28
4.5.2 Searchamode s а dee ы Ы eee eet e да T P TERRE 29
5: ТСОММОМ САТ ОМ: шийир Нн анааан ааа а адаа НЫЙ ЫЫЫ найы HÀ 30
ЭЭС Шан НИ вала лата омы нн ы лады халиа АИ ов нанын и тамы ы ын 31
5 DAB = УМ те Шири ооо о a RU О 32
6--ЛЕА5767ИМ-АРР САТ ОМ... аспасоиисиниялыланыпагылағандайыдықамшанлысшыы а 34
6:1. doe ——————————————————Ó—————— 34
6:2. VCO stank: снове ——————————————— АЫ 36
6:3. Reference frequency... dise eite ipee E ee 37
6.3.1 Internal Соер виа a eo PRU Rena dim m ЕДЫ А А b 37
6.32 Pulling and compensation...........: ciem eee e UT ERREUR eet RE HERE E 38
6:3:3: External referance ss ix. ынена ки ирк nti b RED НИ in, dou cete ta uncus аван CENT 38
6:4. Eayout Ний. л celer Rr ee TR E eR RC Ue e T C e ten ЗЫНЫН КЕИ даллан 39
Үл RBSIRBBDS:-. iine LUE III iim 40
71 RDS/RBDS with $АА6588.......... нение trennen eterne ennt на entren setenta ы нынын нынын нынын 40
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
AN10133
8. .,АШР!О:АМРШЕГЕН....:....:а:4::::4:4444:4444441:24::441:441:41112114441:44::411:2415411:441:42112 1 ай: виса то Рос ER ЕДЕНІНІҢ 41
9 INSTALLATION ОПЛЕ....................................««««««хөөөөөөхөнөхөалхххаахааахаааахааахаахааааааахаааахааааааааааааааааааан 42
9:1' Hardware ene Dee eee re Et RE Res 42
0:9 ома те а ыы И e cnet sch а опада ur E natu а Eo Loon iue LL RE LI Aat. DEAL 43
10 ӨРЕСІҒІСАТТІОМЫ5;;;;/5522иолевелетиеа Овен 46
10.1 EM adio t RDS characteristics ананнын ыман ыла енен а аа АЕ 46
APPENDIX А: TEA5767HN DEMO BOARD (НУОҒМ40 FM-ONLY STEREO)................................ 48
APPENDIX A: TEA5767HN DEMO ВОАНЬ.................................«.«««нө«өнөөөнөөөнөөөнөөлдөхөнааалааанааннаанааааааан 49
APPENDIX A: TEA5767HN DEMO ВОАВО.....................................-.. «не 50
APPENDIX A: TEA5767HN DEMO ВОАВНЬ...................................«««нө«өнөөөнөөөнөөөнөөөдөөлхаллааалааанаанааааааан 51
APPENDIX B: TEA5768HL DEMO ВОАВР................................«.««««өөөөнөөөөөөөнөөлнөөлнхалнааанааанаааааааааааааа 52
APPENDIX B: TEA5767/68HL DEMO BOARD ....................................--..«-. «аана 53
APPENDIX B: TEA5767/68HL DEMO BOARD ....................................--..--. «аана 54
APPENDIX B: TEA5767/68HL DEMO ВОАВНВР................................««єнөөөөөөөхөөөнөөөанхаанхаанааааааанаааанаана 55
APPENDIX C: PR37002 MOTHER BOARD (WITH TDA7053AT AND 5АА65881) ......................... 56
APPENDIX D: PR37156 DSM МТЕВРАСБЕ.......................................х««өөөхөөхөөөөхлөөөлхххлаххааааааахааааааааааан 57
APPENDIX E: COMMUNICATION: WRITE МОГЬЕ.................................«..«««нө«өөөөкөөхөаөхөагхаааааааааааааааан 58
APPENDIX Е: COMMUNICATION: READE МОГЬЕ........................................«.««««єөөөөөөхөөөхөлөхөахахааааааан 59
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 и У
TABLE ОЕ FIGURES
FIGURE 1 BLOCK APPLICATION DIAGRAM OF THE ТЕА5767НМ..........02.......00.000.0-00000000000000000000000020200:000 00 10
FIGURE 2 BASIC APPLICATION DIAGRAM OF ТЕА5767/68 STEREO КАРІЮ................................... ини ааа 12
FIGURE 3 PINNING OF THE TEA5767HN (НУОЕМ40)....... уннын ннн нынын нынын nennen nennen eren eren
FIGURE 4: BLOCK DIAGRAM OF THE SIGNAL PATH OF THE TUNER...
FIGURE 5: BLOCK DIAGRAM OF THE QUADRATURE MIXER ............
FIGURE 6 PILOT DETECTOR OF THE MPX рЕсСорЕВ......................
FIGURE 7 EFFECT OF THE SNC ON THE SIGNAL AND М№ОІЅЕ.................... а.а. ини нии
FIGURE 8 INFLUENCE OF THE НСС ON AUDIO SIGNAL AND МО1$Е ллу ынын etete erete ынын eene eene нынын.
FIGURE 9 EFFECT OF THE SOFTMUTE ON THE SIGNAL AND NOISE AT THE AUDIO ООТРОТ........ линии enne enne 19
FIGURE 10: TUNING SYSTEM WITH A 13MHZ CRYSTAL СГОСК............. линии нап па ван нн па ава eene trn Ы 20
FIGURE 11: PLL SYNTHESISER WITH 32768HZ CRYSTAL СГОСК.......... линии enne папа Әз 21
FIGURE 12: EXAMPLE OF PLL FREQUENCY CALCULATION: HIGH SIDE INJECTION ............ линии nennen нынын нынын ны 22
FIGURE 13: EXAMPLE OF PLL FREQUENCY CALCULATION: LOW SIDE ПМЛЕСТЮМ............ линии ннн ннн ны 23
FIGURE 14: BLOCK DIAGRAM OF IF СООМТЕКВ.......... линии линии enne nennen па ван ни нап папи ƏУ
FIGURE 15: LEVEL ADC INPUT MEASURED VIA THE ВОЗЅ...............................
FIGURE 16: LEVEL ADC AS FUNCTION OF THE RF INPUT LEVEL (V¢c=2.7V)
FIGURE 17: EFFECT OF HIGH/LOW SIDE INJECTION WITH STRONG ӨІСМА16...2.20.0.0....0400.0ыы ыы нн не не не нк нн ен не ннен
FIGURE 18: FALSE STOP BY HIGH LEVEL 8ІСМА15.................М...2.4.4.Ү00200.00000000000000000000 ОО ан нап папи ннн папа папа ы
FIGURE 19 TYPICAL SERIAL INTERFACE APPLICATION WITH ГС BUS INTERFACE............ eerte teretes 30
FIGURE 20 TYPICAL SIERAL APPLICATION WITH 3-WIRE BUS INTERFACE ........... eere ин ни папа аа аты 30
FIGURE 21 DATA TRANSFER FROM AND TO ТЕА5767НМ......... нии nennen вани ни папа инн 32
FIGURE 22 WRITE ACTION IN 3-WIRE BUS INTERFACE ...............1...(.2.1...06000000000000000000000100000000000000Ы ЫЫ ы 32
FIGURE 23 READ OPERATION IN 3-WIRE BUS INTERFACE ........cccsseesssseseeccecessssaeceeececeecueceecceceesesseeeeececsenesaeaeseescseseaaaeeeeeeeeeeenes 33
FIGURE 24 ANTENNA MATCHING CIRCUIT FOR 400 SOURCE ІМРЕБАКЕЕ...............2.4..1.21.0:02.0000000010000000000000000 ы 34
FIGURE 25 FREQUENCY RESPONSE OF THE MATCHING CIRCUIT IN FIGURE 6.1........................... На 34
FIGURE 26 ANTENNA MATCHING CIRCUIT FOR 75 О SOURCE IMPEDANCE
FIGURE 27: FREQUENCY RESPONSE OF THE MATCHING CIRCUIT OF FIGURE 6.3....... ини лилии nennen ннн па eene enn 35
FIGURE 28 DIODE CAPACITANCE AS FUNCTION OF REVERSE VOLTAGE; TYPICAL VALUES ........... eene eee 36
FIGURE 29 TYPICAL OSCILLATOR TUNING CURVE OF PROPOSED FM APPLICATION ........cccccecessessececececsesenseceseeeceesenssaeeeeseeeeenees 37
FIGURE 30 CONNECTION OF THE 13MHZ AND 32768HZ CRYSTAL TO THE TUNER ..........м.м0м000.010100000ə нынын ннн нынын нн. 37
FIGURE 31 CONNECTION OF 13MHZ EXTERNAL 5ІСМАІ...............2.2.2.2..2С0 01000000000000000000000000000 ан нап папи tete nnns s ettet нап папа ныны ннн. 39
FIGURE 32: CONNECTION OF 32768HZ EXTERNAL 5ІСМАІ....................01.00200000000010000000000000000010:000 0 ы 39
FIGURE 33 CONNECTION DIAGRAM OF THE SA A6588 .......................................а аана 40
FIGURE 34CONNECTION ОЕ TEA5767/68 БЕМОВОАЕВР.........м..0000000а11 eene n ни па ан ras ван ии sente deese ннн ннн ннн 42
FIGURE 35 CONNECTION OF THE DSM INTERFACE TO THE МОТНЕВВОАВО......... линии или nnne nennen папа папа net пп nnns seen eene 43
FIGURE 36 FM CHARACTERISTIC OF TEA57567HN DEMO BOARD ................0.2 660000 01010000000000020000000000 ы 47
LIST OF TABLES
TABLE 1 PINNING DESCRIPTION OF THE ТЕА5767НЫЬ.......00000......2.20000000000000000000000000001000 ƏУ 13
TABLE 2: VCO REFERENCE FREQUENCY VERSUS THE CRYSTAL FREQUENCY лнн нн нынын нынын. 22
TABLE 3: COUNTER RESULT DEPENDING ON THE Fyra, FLAG
TABLE 4: SEARCH STOP ІЕУЕІ..................... шш
TABLE 5: SPECIFICATION OF NX4025GA 13MHZ CRYSTAL
ТАВЕЕ:6' VOEUMEACONTROD: A eee re te e ed Petre m t T ен
TABLE 7: EM?RADIO-ERDS/CHARACTERISTIGS.; 5 ыссы vetet ee eye ЕЛЫ eere vede stove dte Deve ve es Pede Pe URN Ve sae ЫЫ ewes eos ie
<THIS PAGE IS LEFT EMPTY>
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
1 INTRODUCTION
The consumer demand of more integrated and low power consumption IC's has increased tremendously in the
last decade. The IC's must be smaller, cheaper and consume less power. Especially for portable equipment like
mobile phone, CD, MP3 and cassette players, these requirements are very important. In order to integrate a
radio function in this kind of equipment it's also important that the total application 1s small sized and the
overall power is low. The ТЕА5767/68 is a single chip digitally tuned FM stereo radio. Its application is small,
has a very low current consumption and 15 completely adjustment free. This makes the PCB design easy and
save design-in time. The tuner contains all the blocks necessary to build a complete digitally tuned radio
function.
The FM tuners consist of three IC's in 32 pins or 40 pins package. The IC's can be controlled via a 3-Wire, I2C
or both bus interfaces.
A small application PCB demo board has been designed on which either of the three IC's can be mounted.
These demo boards can be placed on a motherboard, which can be extended with an audio amplifier and a Radio
Data System (RDS/RBDS) IC.
The three tuners are:
e ТЕА5767НМ FM stereo radio, 40 leads with РС and 3-Wire bus interface, Body 6*6*0.85 mm,
5ОТ1618
е ТЕА5767НІ, ЕМ stereo radio, 32 leads with 3-Wire bus interface, Body: 7*7*1.4 mm, БОТ 358.
е TEAS5768HL FM stereo radio, 32 leads with РС bus interface, Body: 7*7*1.4 mm, SOT358.
In this application note only one IC, the TEA5767HN and one demo board will be described. However, this
description can also be applied for the other boards.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
2 SYSTEM GLOBAL VIEW
2.] The ТЕА5767
A block diagram of the TEA5767HN is given in Figure 1. The block diagram consists of a number of blocks
that will be described according to the signal path from the antenna to the audio output.
The RF antenna signal is injected into a balanced low noise amplifier (LNA) via a RF matching circuit. In order
not to overload the LNA and the mixer the LNA output signal is fed to an automatic gain control circuit (AGC).
In a quadrature mixer the RF signal is converted down to an IF signal of 225KHz by multiplying it with a local
oscillator signal (LO). The chosen mixer architecture provides inherent image rejection.
The VCO generates a signal with double the frequency necessary for the I/Q mixer structure. In the N1 divider
block, the required LO signal is created. The frequency of Фе УСО is controlled with а PLL synthesiser system.
The I/Q signals out the mixer are fed to an integrated IF filter (RESAMP block). The IF frequency of this filter
1s controlled by the IF Centre Frequency adjust block.
The IF signal is then passed to the limiter block, which removes the amplitude variation from the signal. The
limiter is connected to the level ADC and the IF counter blocks. These two blocks provide the proper
information about the amplitude and frequency of the RF input signal, which will be used by the PLL as stop
criterion.
The IC has a quadrature demodulator with an integrated resonator. The demodulator is fully integrated which
makes IF alignments or an external resonator unnecessary.
IF Center їе!
Freq. Adjust 146
ЖА, СН Ж. МРХООТ А LEFT RIGHT
47п [470 ат 33n. Т ЗЭ, 7 Ч
30 29 28 27 26 25 24 23 | 22 21
"с-з 20 - пе.
ү 18КО з2
3 GAIN POWER
EASY STABI SUPPLY
33
220 |. Бори
ме — |T 34
t
470 DEMOD
p» I»
RESAMP LIMITER = x >| SOFT
— MUTE
L | —
ТМАНТ /О-МІХЕН 5
1
V istFM [a та Y Y
x —
Р 11 грма со, ТЕА5767НМ
1 27p] 35 5
~ шэн — г> 2
12008 Я AGC 9 191 іп
47р 3 |“ 8
m
2
ГА
=
РА
У
18 2201
4Лп 33K 22n 4
AN.
38
xl H а е)
17 сотр _ ГА
—— XTAL У
Р osc 16 |Сриц За ЗМНЕ
1-0-6
TUNING SYSTEM Prog. Div. out ы тамна
EN 15| 10K
Prog. Div. out MUX SWPORT 1-1
39 >| А jk cde
| Ч
s TOK Уос
i LL. ilot
1 Mono
vv [ 13
а i BusEnable
vco I2C/3WIRE BUS < BUSMODE
п < Write/Read
40
1 2 3 |4 5 6 7 8 |9 10
A == 39n
10n пок [ кй YS
g4 = Х
Di 02 5 А
100K Ши ^ne > L—-1
i3 [2 по |. D^ cL
22n
g
zx хх.
221”
aid |
1
Figure 1 Block application diagram of the ТЕА5767НМ
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
The stereo decoder (MPX decoder) in its turn is adjustment free and can be put in mono mode from the bus
interface.
The stereo noise cancelling (SNC) function gradually turns the stereo decoder from ‘full stereo’ to mono under
weak signal conditions. This function is very useful for portable equipment since it improves the audio
perception quality under weak signal conditions.
The softmute function suppresses the interstation noise and prevents excessive noise from being heard when the
signal level drops to a low level.
The tuning system is based on a conventional PLL technique. This is a simple method in which the phase and
the frequency of the VCO are continuously corrected, with respect to a reference frequency, until frequency
acquisition takes place.
Communication between the tuning system and an external controller is possible via a 3-Wire ог РС bus
interface.
2.2 FM STEREO application
The application is identical for the three IC's as mentioned in chapter 1. This application comprises two major
circuits: RF input circuit and a FM oscillator circuit.
The communication with a џ-сотршег can be performed via an РС or a 3-Wire serial interface bus, selectable
with BUSMODE pin, for the TEA5767HN. TEA5768HL operates in РС bus mode and TEA5757HL in 3-Wire
bus mode.
The receivers can work with 32.768K Hz or 13MHz clock crystal, which can be programmed by the bus
interface. The PLL can also be clocked with 6.5MHz clock signal.
Three audio outputs are available: audio left, audio right and MPX (multiplex).
A basic application diagram of the FM receiver is shown in Figure 2.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68
Application Note
АМ10133
ЕМ АМТ
TEA5767HN/HL
TEA5768HL
Bus Enable
BUSMODE
Read/Write
T
Clock
<
Data
MPX
—
Audio Left
|
Audio Right
іы»
Шин
32.768КН2
кес ог
13МН2
01 02
= Bt
L3 L2
CY HO
Vccosc
NSA
SS
Figure 2 Basic application diagram of TEA5767/68 stereo radio
2.3 TEA5767HN package
The TEA5767HN FM stereo radio is a 40 pins HVQFN (SOT1618) package IC which can be operate with РС
or 3-Wire bus interface. The fully integrated IF selectivity and demodulation make it possible to design a very
small application board with a minimum of very small and low cost components. The outline of the
TEA5767HN package is 6*6*0.85 mm.
IGAIN
AGND
vcc
RFIN1
RFGND
RFIN2
CAGC
LOOPSW
NC7
NC5
о
8
LIMDEC2
м
8
ю
LIMDEC1
TIFCENTER
у | VREF
ю| МРХОШТ
5
MUTE
по | МАРА
МАР.
NC4
м
5
м
қ
a
ГЭ
R
8
м
R
X
ТЕА5767НМ
©
5
©
ә
3
>
a
Е
o
ә
NC1
CP10UT
VCOTANK1 | о
VCOTANK2 | к
VCCVCO | л
DGND|o
VDIG | ~
SDA |o
SCL
NC2
NC3
PILDET
PHASEDET
XTAL1
XTAL2
SWPORT1
SWPORT2
BUSENABLE
BUSMODE
WRITE/READ
Figure 3 Pinning of the TEA5767HN (HVQFN40)
Figure 3 shows the pinning of the TEA5767HN and Table 1 gives a description of each pin of the IC.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
AN10133
DESCRIPTION SYMBOL
маоше | [ws |
Charge pump output of the synthesiser PLL 1.64V VAFL
c5
Audio left output
Di
ceou ppt
Time constant for the softmute
V
VCOTANKI VCO tuned circuit output 1 VAER
VCO tuned circuit output 2 TMUTE
УССУСО ЕМ demodulator MPX out
іку
Decoupling IF limiter 1 1.86V
VDIG
BUSENABLE
Bus data line input/output || LIMDECI
Bus clock line input |Н LIMDEC2
маоше ОИ cs Ee
MBOL
СІ
Т
УСОТАМК2
GND
C2
Digital supply voltage 2.5V TIFCENTER
Write/read control for the 3-Wire bus
IGAIN
Bus enable input AGND
VCO supply voltage MPXOUT
Not connected ШАА
|ғы |
|
| |
|
|
[pop — (c ПО ес wer | |
[ухе іо | а
[s |
[s |
| о |
3 33
Analog ground 0
DESCRIPTION
Time constant for IF centre adjust 1.34V
Decoupling IF limiter 2 1.86V
Gain control current for IF filter 0.48V
SWPORTI 4 Software programmable port 1 УСС 34 Analog supply voltage 2.5V
SWPORT2 2 Software programmable port 2 КЕМІ 35 КЕ іпрш 1 0.937
XTALI 6 Crystal oscillator input 1 1.64V RFGND 36 RF ground оу
XTAL2 Ч Crystal oscillator input 2 1.64V RFIN2 37 RE input 2 0.937
PHASEDET 8 Phase detector loop filter 1.0V CAGC 38 Time constant RF AGC
PILDET 9 Pilot detector lowpass filter 0.7У LOOPSW 39 Switch output of synthesiser PLL filter
NC3 20 Not connected NC7 40 Not connected
Table 1 pinning description of the TEA5767HN
DRAFT 13
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
3 ТНЕ ТЕА5767НМ
The ТЕА5767НМ consists of three major blocks: the signal channel, the tuning system апа the bus interface. In
this chapter the signal channel will be described briefly. The tuning system and the interface will be explained in
chapter 4 receptively 5.
In Figure 4, a block diagram of the signal path is given.
MPX
Input | Softmute |-4» out
Audio
left
Audio
right
IF Center
Freq.
Adjust
Stereo
decoder
Figure 4: Block diagram of the signal path of the tuner
3.1 Low Noise Amplifier
The TEA5767HN has an integrated low noise amplifier (LNA). This is a balanced amplifier, which is less
sensible for common mode noise.
The input impedance of the LNA is (100О|ИрЕ) each pin (referenced to ground).
To handle high level input signals, the gain of the LNA is controlled by means of an automatic gain controller
(AGC). The AGC will be started when the antenna input reaches a level of about 4mV with a given application
of 40Q antenna impedance. The AGC has a range of 40dB.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
3.2 Mixer
The TEA5767HN has a complex mixer. This mixer receives two RF signals directly from the LNA and delivers
two signals with an intermediate frequency of 225KHz. The mixer output signals comprise an in-phase
component (0?) and a quadrature component (909).
A block diagram of the mixer is given in Figure 5.
МА output1 ЯВ
> |п-рћазе
component
А
0° | Local
909 79 2119 Oscillator
LNA output2
_ошр -50) Ж Quadrature
component
Figure 5: block diagram of the quadrature mixer
Theoretically, complex mixers can create perfect image cancellation and do not need an image rejection filter.
However, because of imperfection in the channel end or LO divider signals, the tuner will have a limited image
rejection problem.
3.3 ТЕ selectivity
The selectivity is provided by a band pass filter with a low intermediate frequency (IF). This IF filter 1s fully
integrated, which results in an alignment-free selectivity. The centre frequency of this filter is 225KHz and has a
—3dB bandwidth of 90KHz.
At 200K Hz from the centre frequency, the IF filter selectivity is about 40dB.
The centre frequency of the IF filter is internally adjusted in order to remove the influence of process spread.
3.4 Limiter
The limiter is DC coupled with feedback capacitors on pin 28 and 29. These capacitors build a low pass filter.
3.5 Demodulator
The demodulator is also fully integrated. The advantage of this is that no alignment will be necessary.
The demodulator has a conversion factor of 75mV at 22.5kHz.
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
3.6 Тһе MPX decoder
3.6.1 The PLL
The stereo decoder PLL runs at 228kHz (12*19K Hz). When using a crystal of 13MHz, the VCO is internally
preset to 227.5K Hz. The frequency sensitive phase detector can only accelerate the VCO. After the PLL is
locked on the proper frequency (228KHz), it will become inactive.
When the crystal clock frequency is changed the principle stays the same. The PLL in a locked situation is still
running at 228KHz. The preset frequency, however, is now 229.4K Hz. In this situation, the phase detector can
only slow down the VCO until the PLL is locked on 228kHz.
A divider delivers a quadrature 19KHz signal, which will be multiplied with the 19KHz spectral component of
the MPX signal. When there is a phase difference between the two signals, a dc current is generated that will
adjust the VCO until synchronisation has taken place.
Care should be taken with the capacitors used in the loop filter (pin 18 of TEA5767HN). Any leakage current
due to these capacitors will affect the PLL VCO free running frequency and will reduce the capture range and
channel separation. Therefore, capacitors with a stable temperature coefficient are recommended.
3.6.2 The pilot detector
Via a divider circuit, the PLL stereo decoder will deliver the 19kHz, 0^ signal to the pilot detector. This signal
will be multiplied with the pilot present in the MPX signal. This will give a DC signal that is proportional with
the pilot amplitude.
The pilot filter will remove the audio information and the 38kHz components. Figure 6 gives a block diagram
of the pilot detector.
VCO
19KHz, 0°
E) 228KHg | Div. by 9KHz, 0 | Mono/stereo
12 Pilot Pilot
detector
MESS L Pilot
filter
LET
Figure 6 Pilot detector of the MPX decoder
Bit 7 of byte 3 gives an indication of stereo reception. When this bit is high the reception is stereo otherwise
mono. Leakage current due to the pilot filter will decrease the pilot sensitivity. This can lead to erroneous
indication of the stereo reception
3.6.3 The SNC
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
When the Stereo Noise Cancelling -also named SDS (Signal dependant stereo)- is on, it will switch the stereo
decoder from stereo to mono in case a weak signal is received. This will limit the output noise of the decoder.
Also by the absence of the pilot or when the stereo control is switched to “force mono", switching SNC on or
off will not affect the audio reception so that only mono information will be passed to the audio output
The SDS can be switched via the bus with bit 1 of data byte 4.
Figure 7 gives a typical measurement of the audio signal and noise with SNC on and SNC off.
rese
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те |
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Badin ci ки of r 1 ай Б^Л и AR. ОН: РНЫ sibi ЫН. ”
Hrn қ ir рта ен ЕК Баранин гр ЯЛЛ ЫН
___| | ог" и и“ кешіп a БН Ab. ниені ЕйН adhi ЫН
Шилэн SET 2 bz ET Ч Legit: АР: Gey Püs ET Ы
i : Ч ә i 1
Bardem У | Bb Бич aris i АҒ: __ РК ате Гі Ми Ранхийнд dax HU Massa Da па 13
Figure 7 Effect of the SNC on the signal and noise
3.6.4 The matrix decoder
The matrix decoder calculates the audio left and right signals and delivers them to the outside of the IC via pin
22 and 23.
3.6.5 HCC
High Cut Control is an option, which gives the possibility to cut high frequencies from the audio signal when a
weak signal 15 received.
The HCC can be switched via the bus with bit 2 of data byte 4.
Figure 8 illustrates the influence of the HCC op the audio signal and noise.
DRAFT 17
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
Ducum?
TEASTRTHH deme board Баға Theres 21 Шахс Нат, 85-0
= 20 - ==
D py un ITE 211171 Г L | тікі my! м
Нолган- ДЕ ouput measured with А оду гыр Dier тилин
рє P: РЕ заа инг 8Г: НЕЁ Н! тег Че
мн нні ава
E м - 12 аи
Bad
чанг
Яана LL DM k HB п
Чары HDI DH ке HR PRÉ TIMES ағ. БЕН: НЕ Ғнканныу- 57.3 Мт
ч mie
Figure 8 influence of the HCC on audio signal and noise
3.7 Тһе softmute
The RF input signal can come under weak level input so that the total noise energy in the AF spectrum can be
larger than the AF signal. This causes an unpleasant sound. When activated, the softmute will limit the amount
of noise energy in the AF spectrum. The inter-station noise is then attenuated which will result in a better
perception of the audio signal.
The softmute is controllable via the bus interface. By setting bit 3 of data byte 4, the softmute is switched on.
Otherwise it is off.
Figure 9 illustrates the working of the softmute.
DRAFT 18
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
="
ТЕАВЗТБТНЫ demoboard Гази Par 17 алга МЫП БУЙ
ран — s
Бара кэЗгьлж oF
ширем Мати побио ое У NÉ
=
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Riera АҒ айги nau pd meth ма Weg игру hiv ТЕ
пер dita
bhas ыш аг 28 = М паа" pu ЕР
Sie ieee он и ли. 23.3 dB ми КАН:
ари! чени на ін КЕ БЫ OREL ER “ИН. А = г
Maus паша za Бы ЕР = ај ЗА ыз!
ЕТЕ Ванны ЧОН тете та Brier "Г
Figure 9 effect of the softmute оп the signal and noise at the audio output
DRAFT 19
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
4 THETUNING SYSTEM
The ТЕА5767НМ tuning system 15 based on a conventional PLL technique. The tuning system is controlled by
means of state machine.
In this chapter the tuning system, level ADC and IF counter will be described.
4.] The PLL tuning system
The tuning system is based on the conventional PLL technique. This is a very simple concept in which the
programmable divider is stepwise increased or decreased until a signal is found.
In a phase detector (PD) the output signal of the programmable divider is compared to a reference frequency.
The PD steers a chargepump, which via a loop filter will deliver the necessary tune current to the VCO. The
PLL uses two loop filters with different time constants. At the first stadium, the loop must be fast for quick
response but later the loop should have a narrow bandwidth to limit noise contribution in order to achieve a
good signal to noise ratio.
13MHz [oni gy] fe 25KHZ MET
520 detector (>| chargepump
E г”
0? 90? 1/0 MIX
— ai
12bits programmable
Div. by 2}? divider
Loop
filter 1
УСО С) Іше 4 Г
| ; Loop
filter 2
m Found fla
setting/preset of the ши 9
programmable divider tuning state I— — Band limit flag
lower machine setting of the
—-
gn d ҚАН — p > programmable
divider
search up/ —~ | Е IF counter
down result
| А
counter result Level ADC
Level ADC е == г №» Level OK
Figure 10: tuning system with a 13MHz crystal clock
The PLL synthesiser can operate with either 32.768KHz or 13MHz crystal clocks. The choice for 13MHz is due
to the fact that this frequency is utilised in mobile phones so that an extra crystal is not necessary in that kind of
application. The 32768Hz clock signal makes it possible to use the cheap watch crystal.
Further it 1s possible for the synthesiser to be clocked externally with 13MHz, 6.5MHz or 32768Hz clock signal
(see pragraph 6.3.3, page 38).
In Figure 10 and Figure 11, a block diagram of the tuning system is given when using a 13MHz crystal
respectively 32768Hz.
DRAFT 20
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
32768Hz f,,716384Hz
Div. by 2 | Phase
detector — 9 chargepump
E г”
0° 90? 1/0 MIX
— ai
12015 programmable
Пм.Юу2|Ї--Э” divider
Loop
filter |
УСО С) lune | |
Loop
filter 2 |
m Found fla
setting/preset of the с 3
programmable divider tuning state I— — —»- Band limit flag
У machine setting of the
— |
уррегломег — — $ > programmable
band limit divider
search up/ — | ==; IF counter
down result
| Ех
counter result ~ Level АРС
Level ADC [> Level OK
Figure 11: PLL synthesiser with 32768Hz crystal clock
In contrast to most tuner systems that use ап IF of 10.7MHz, the ТЕА5767/68 uses a low IF of 225KHz. With
this low IF, integration of the IF filter becomes feasible. This aims to reduce the overall system costs and power.
Further the tuner can work in two modes: high side injection or low side injection. The choice of one of these
modes determines whether the local oscillator is placed above or below the wanted frequency (see Figure 12 and
Figure 13), swapping the image with respect to the reception frequency. This feature is added due to the
practical achievable image suppression that can be obtained (see paragraph 4.5).
As the figures illustrate, the image frequency is situated at 450KHz (2*IF) distance below or above the wanted
frequency. In software, the HILO bit can used to put the tuner in high side injection mode (HILO=1) or low side
injection (HILO-0). The HILO bit is bit 4 of data byte 3.
4.2 PLL word calculation
To tune the radio to a wanted frequency, the corresponding PLL word must first be calculated. This is a 14 bits
word, which will be sent to the programmable divider.
To do this a distinction will be made between high and low side injection.
4.2.] High side injection tuning
In high side injection mode the PLL word is calculated with the following formula:
(4* (Fee + F,))
ш-------- with:
di Peers
Мс = Decimal value of PLL word
Fgr — the wanted tuning frequency [Hz]
Fir = the Intermediate Frequency [Hz]
Frers = the reference frequency [Hz]
In the PC control software this is implemented in the following way:
DRAFT 21
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
4* (TunedFrequency “1000 + F; )
REF[XTAL]
1000
PLL = ROUND
PLL = Npgc = Decimal value of PLL word
TunedFrequency is the wanted tuning frequency in MHz,
Еу15 the Intermediate Frequency of 225 kHz,
REF[XTAL] is the reference frequency in kHz, which depends on the selection of the oscillator
frequency as shown in the table below:
XTAL | PLLREF | Reference frequency | Crystal frequency
о [o [50000Hz 13 MHz
озодона [63 MHz _____
32768 Hz 32. 768 kHz
Table 2: VCO reference frequency versus the crystal frequency
Now that The PLL word has been calculated in decimal, it must be converted to Hex decimal before sending in
to the tuning system.
If the receiver has to be tuned to a FM frequency of 100МН2, the PLL word will be calculated as follow:
1
4 + (100 #1000 + 225)
50000
1000
PLL ype = ROUND =8018
PLL py =1Е52
Figure 12 gives an example of frequency tuning with high side injection.
E(co7200.45MHz
High Side Injection
2
4
Еуашгі-100МН2 Еіо-100.225МН Fimage=100.5MHz
Figure 12: Example of PLL frequency calculation: high side injection
DRAFT 22
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
4.2.2 Low side injection tuning
To calculate the PLL word in low side injection mode the following formula is used:
4*(Е„-Е,)}
Е
КЕР5
Мс =
The parametrs stay the same as for high side injection.
To tune the tuner for example to 100MHz, the PLL word can be calculated as follow:
4 + (100 #1000 – 225)
50000
1000
РИ = ROUND = 7982
PLL py =1Е2Е
Figure 13 illustrates a frequency tuning when low side injection mode is applied.
Fyco=199.55MHz
Low Side Injection /
:2
Fimage=99.5MHz F1,799.775MHz Fwantea = 100MHz
Figure 13: Example of PLL frequency calculation: low side injection
4.3 IF counter
To measure the intermediate frequency (225КН2) of the receiver, the tuning system uses а 7 bit IF counter (see
Figure 14). During a time window the IF counter will count the limited IF signal. The counter counts during a
measurement time which is15.75ms for 13MHz crystal апа 15.625ms for а 32768 clock, with a resolution of
4062.5Hz respectively 4096Hz.
If the Level OK signal = “1”, the state machine of the tuning system will start the IF counter. At the end of the
measurement time, the counter produces a value that is an indication of the intermediate frequency. The counter
result will be delivered to the tuning system for evaluation.
DRAFT 23
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68
Table 3 gives possible correct counter results.
Level OK
Figure 14: block diagram of IF counter
7 bit IF
counter
Application Note
АМ10133
IF Counter
result
The counter result is also available via the bus. To read this result, the following actions will be taken:
- Write to bus
- After a write operation the result will be ready after 27ms. Wait until the result is available for the bus.
- Read the result.
Because the IF counter is not automatically updated, each time a read action is required, a previous write action
must be performed.
At the end of the counting, the counter will be reset and a new cycle can be started again.
Counter result
IF input [KHz] Е ла flag = 1 Е ла flag = 0
200 31 30
225 34 37
250 ЗЕ ЗЕ
Table 3: counter result depending on the Fy.) flag
DRAFT
24
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
44 Level ADC
The level ADC block is an analogue to digital converter (ADC), which gives an indication of the fieldstrength
of the RF input signal. This block is a four bits ADC, with 3dB resolution each bit. The level can be measured
via the bus via bit 4, 5, 6 and 7 of data byte 4
A typical measurement of the level ADC is illustrated in Figure 15. The y-axis gives a decimal representation of
the level ADC. The x-axis represents the RF input level, which is given in dBLV.
о
а
ч
6
>
Ф
4
RF input level (dBuV)
Figure 15: Level ADC input measured via the bus
A copy of the level ADC can be measured at TMUTE, pin 24. The impedance of this output is very high (about
400КО) and together with a capacitor (33nF) form a low pass filter, which filters the amplitude variations. This
high ohmic output can only be measured using a very high input impedance device (e.g. FET or an OpAmp ).
The level ADC information at pin 24 is given with reference to the supply voltage.
Figure 16 gives a typical curve of the level ADC as a function of the RF input level (У. =2.7М)
Even when there is no RF input signal, the level output DC voltage is about 1,64V. From an input signal of
1.60 V (4аВиМ) the level output rises linearly until it reaches a value of 2.1V at an input signal of Іту
(60dBuV). From then, the level output stays constant.
DRAFT 25
Philips Semiconductors
L oltage FM stereo radio with TEA5767/68 Application Note
хиад АМ10133
ю
=
Ф
о
S
=
o
>
E
Ф
4
о
30 40
RF input level (dBuV)
Figure 16: level ADC as function of the RF input level (У „=2.7У)
DRAFT 26
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
4.5 Tuning Algorithm
The tuning system can perform an autonomous search, or search can still be done in the classical way under uC
control. When the tuner receives a (autonomous) search request (bit 6 of data byte 1 18 set) it will begin scanning
the FM band until a frequency is found or the band limit 15 reached.
High/Low side issues
As early discussed in this paragraph, the TEA5767/68 сап be operated in two modes: High or Low side injection
selectable with HILO bit (bit 4 of data byte 3) via the bus interface. Under certain circumstances 15 the selection
of one of these modes not arbitrary. This 1s the case when high level signals are involved, as illustrated in Figure
17.
Scanner output
F—3——m—3
: || ___-| | M __-~ |
Qo сул EE 1
970 972 974 975 918 900 982 984 985 988 99.0
Auto clear [^ М Lockto grid
Step Delay У | 40 ов | Н
| ма | Search Levels Lower Limit) 97.0 Upper Limit! 99.0 Defaut |
Figure 17: effect of high/Low side injection with strong signals
The wanted station is at 98 MHz at a signal level of 100 рУ and there is a strong neighbouring station at 98.4
MHz with a signal level of about 2.5 mV. With HILO=1 (black curve) the image response of 98.4 MHz is right
on top of the wanted station at 98 MHz, masking this wanted station. With HILO=0 (red curve) no interference
is heard on 98 MHz. The image of the unwanted station can now be found at 98.85MHz.
In the demo software the following algorithm is used to set HILO to the optimal level:
Set HILO to “1”.
Tune to Fwanted + 450 kHz: measure signal level > LevelHigh
Tune to Fwanted — 450 kHz: measure signal level > LevelLow
If LevelHigh < LevelLow then HILO is “1” else HILO is “0”.
DRAFT 27
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
In the given situations no problems will arise with search tuning ав the image frequencies are not оп the search
grid of 100 kHz.
However when the signal level of the wanted station increases to above about 3 mV false stops may be
introduced due to unwanted mixing effects in the FM signal channel (see Figure 18).
100%
AX $
Hi E ү.
i ОЕ aaa
p wN тав ч
Tome am толт | | 1
970 972 974 978 978 980 982 984 986 988 990
Auto clear Iv. Lockto grid
Step Dely У | 10 Сен | жа | Search Levels — LowerLimt| 97.0 Upper шта 99.0 Defaut |
Figure 18: false stop by high level signals
Now two additional stops are introduced at 98.1 MHz (HILO -1) and on 98.7 MHz (HILO - 1) (see the circles
around the signals in Figure 18).
In the demo software these stops are rejected with the following algorithm:
Measure the level when the search has stopped Level 1
Toggle the HILO bit and measure level again > Level 2 and also read the IF counter result > IFC
Tuning is correct when the following formula is met:
Absolute value of (Levell — Level2) < 2 and $31 < IFC < $3E
4.5.] Preset mode
To tune the radio a wanted frequency the following actions will be taken:
First a PLL word has to be calculated. In paragraph 4.2.1 and 1, it has been explained how to calculate this
word. If a high side injection is desirable the HILO bit is set to 1 otherwise 0. This information has to be sent to
the tuner.
Other information can also be sent to set on/off the softmute (bit 3 of data byte 4), HCC (bit 2 of data byte 4)
and SNC (bit 1 of data byte 4), etc
DRAFT 28
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
4.5.2 Зеагсћ тоде
To perform an autonomous search, MUTE апа SEARCH bits should be set. At the same time the current
frequency has to be increased or decreased with one grid step. The search direction and the stop level (see Table
4) can be chosen.
This information can be sent to the digital tuning and the control software must keep on reading until bit
READY=1. In that case a station has been found or a band limit has been reached. In the last situation also the
band limit flag is “High” (bit 6 of data byte lin read mode). The software then has to wrap the frequency to the
other band limit and initiates a new search action. At the end of the search action the MUTE bit should be set to
Zero again.
When a stop has been detected the HILO algorithm will be performed to check if the stop is valid and to find an
optimum setting for the high/low side injection.
Bit б of data byte 3 | Ви5 ofdatabyte 3 | Field strength | Level ADC
о Па ____| Don’t саге |
0 1 Low 0101
| 1 | | 0 9JMiddl 0111
1010
Table 4: search stop level
Care should be taken to prevent the algorithm ends up in an infinite loop when no station has been detected.
This can be done either by lowering the search level or by exciting the loop when the band limit is reached for
the second time.
N.B
Because the tuning system is internally provided with 100kHz grid step, care should be taken when the tuner is
clocked with the 32768Hz reference frequency. The grid step is then 98.304kHz (3%32768Н2).
In that case, when performing a search and a station is found, the PLL word of the programmable divider will
be read. The value of this word will be rounded and sent back to the tuner.
DRAFT 29
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
5 COMMUNICATION
The TEA5767HN can communicate with the external controller via an integrated on-chip bus interface. The
tuner supports both РС and 3-wire bus interface, selectable via BUS MODE pin.
The bus interface is accessible via five pins. A typical РС interface application is given in Figure 19, and a 3-
Wire interface is given in Figure 20.
The function of each pin is given below.
BUSENABLE
BUSMODE р
ТЕА5767 READ/WRITE Don't care
CIOCK
DATA
Figure 19 typical serial interface application with ГС bus interface
BUS ENABLE (input)
The BUS ENABLE signal should be activated before any data transfer via the bus can be performed.
If the BUS ENABLE pin is LOW, the bus interface is deactivated. When the standby bit (bit 6 of data byte 4) is
HIGH and the BUS ENABLE pin is LOW the standby current of the IC can be reduced below 10uA.
BUSMODE (input)
With this pin either the РС or the 3-wire bus interface can be selected. If the BUSMODE pin is connected to the
ground the IC will operate with C bus. If the BUSMODE pin is high 3-wire bus is selected.
BUSENABLE
BUSMODE
TEAS 767 READ/WRITE
CIOCK
DATA
Figure 20 typical sieral application with 3-Wire bus interface
DRAFT 30
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
READ/WRITE (input)
A positive edge of the READ/WRITE pin enables data transfer in the IC. A negative edge at READ/WRITE pin
enables the data transfer out the IC.
This pin is not used in РС mode.
CLOCK (input)
For clocking DATA in and out the shift register.
DATA (input/output)
The data input/output enables the data transfer from and into the IC.
The software can read valid data any time and without interrupting the search function. Writing data to the IC
will interrupt the search function and the sent data will define the new status.
Care should be taken when continues reading is required, because the data on the output registers 18 not continue
updated. Therefore each read action should be proceeded by a write action.
In the next paragraphs a brief description of РС and 3-Wire bus interface will be given.
5.1] ГС bus interface
РС is a simple bi-directional bus interface. The bus requires only two lines, which are serial data (SDA) and
serial clock (SCL). The bus is 8-bit oriented. Each device is recognised with a unique address.
The РС bus operates with a maximum frequency of 400K Hz.
Data transfer to and from the TEA5767HN can begin when a start condition 18 created. This is the case if a
transition from HIGH to LOW on the SDA line occurs while the SCL is HIGH (see ).
The first byte transferred represents the address of the IC plus the data direction. A LOW LSB of this byte
indicates data transmission (WRITE) while a HIGH LSB indicates data request (READ).
Each data put on the SDA must be 8-bits long (Byte) and each byte sent should be acknowledged by “АСК” bit.
In case a byte is not acknowledged, the transmitter should generate a stop condition or restart the transmission.
At power on, the mute bit (bit 7 of data byte 1) 1s set. All other bits are set to low. To initialise the IC all bytes
should be transferred. If a stop condition is created before the whole transmission is completed, the remaining
bytes will keep their old setting. In case a byte is not completely transferred, the new bits will change their
setting but a new tuning cycle will not be started.
The transfer of data bytes should be ordered from low to high. First the address then byte 1, byte 2, etc. The
MSB of each byte will be send first.
The IC address is 1100000. This means that the first byte to be transmitted to the TEA5767HN should be “СО”
for a WRITE operation or “C1” for READ operation.
A transmission can be terminated by generating a stop condition. This is the case when the SDA goes from
LOW to HIGH while the SCL is HIGH.
DRAFT 31
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
ACO КТ
19, Б
START ADDRESS READ/ ACK DATA ACK DATA ACK STOP
condition WRITE condition
Figure 21 data transfer from and to TEAS767HN
5.2 3-Wire bus
3-Wire bus is a serial interface with 3 lines: WRITE/READ, CLOCK and DATA. The bus operates at a
maximum rate of IMHz.
With the WRITE/READ line the direction of the data can be selected. A negative edge at this pin enables data
transfer out the IC. While a positive edge of WRITE/READ pin allows data to be written to the IC. The
WRITE/READ pin should change only if the clock is LOW.
At power on, the mute 18 the unique bit, which is set. АП other bits are random. To initialise the IC all bytes
should be transferred.
Write mode
A positive edge the WRITE/READ signal indicates that data can be transmitted to the IC. During the next clock
pulse data must be stable. Data may change only if the clock is LOW.
At rising edge of the clock data will be shifted in the register.
The data transfer can be terminated by setting the WRITE/READ pin. This is possible after sending two bytes of
the new tuning information or after each following byte.
WRITE/READ | |
даа A | data
— shift change
Figure 22 write action in 3-Wire bus interface
DRAFT 32
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
Кеад тоде
А negative edge of the WRITE/READ pin indicates that the ц-сопітоПет wants to read data from the IC. The
WRITE /READ pin must change only if the clock is LOW.
At rising edge of the bus clock data 18 shifted out the register. This data is available from the moment that the
clock is HIGH until the following rising edge of clock.
During the positive edge of the clock, data must be stable.
Setting the WRITE/READ pin HIGH will terminate the read action.
Prior to a read action a write action is required in order to update the read register content.
WRITE/READ A /
CLOCK
data data
ready available
DATA
Figure 23 read operation in 3-Wire bus interface
DRAFT
33
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
6 ТЕА5767НМ APPLICATION
The TEA5767HN has а simple application with a few external components. This application comprises two
major circuits: the RF input circuit and the FM VCO circuit (see Figure 2).
In this paragraph the TEA5767HN application will be described.
61 RF input
The antenna-input signal is fed into the balanced FM-RF inputs (pin 35 and 37) via a RF matching impedance
circuit. A series capacitor, two parallel capacitors and a coil (L1) build this circuit. The coil used in this circuit
should have a minimal Q factor of 30. Its tolerance is + 5%.
Together with the impedance of the LNA, the RF matching circuit forms a low Q band pass filter
In order not to affect the sensitivity of the receiver, the circuit can be optimised to match the antenna impedance.
Figure 24 gives a typical matching circuit for 400 source impedance. The frequency response of this circuit is
given in Figure 25.
RFIN C1
> | + ВАМ
100рЕ
Rgenerator=40 Ohm 2158
27рЕ
L1 Р
• ——ђ RFGND
120nH
| C3
47pF
5 > RFIN2
Figure 24 Antenna matching circuit for 400 source impedance
RFI-RF2
(dB)
Frequencies (MHz)
Figure 25 Frequency response of the matching circuit in figure 24
DRAFT 34
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
AN10133
Figure 26 gives an example of a matching circuit for 750 source impedance. The frequency response of this
circuit is given in Figure 27
RFIN C1
> | | А => RFIN1
100рЕ
Rgenerator=/9 Ohm a=
56pF
11 4
$— — —»- RFGND
100nH
_| сз
56рЕ
4 > RFIN2
Figure 26 Antenna matching circuit for 75 Q source impedance
i5, OR 79,08 шон
їн
444 ЭН
Frequencies (MHz) F
Figure 27: frequency response of the matching circuit of figure 26
DRAFT 35
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
62 VCO tank circuit
The VCO circuit produces a signal at double frequency necessary for the tuning system. A divider will half the
frequency of this signal and then deliver it to the PLL.
In the proposed application the used tuning diodes D1 and D2 are BB202. This ultra small diode is fabricated in
planar technology. It has a low series resistance (0.80 maximal), which 15 very important for the signal to noise
ratio (SNR). In Figure 28, the capacitance value of this diode is given as function of the reverse voltage.
In our application proposal these diodes can tune the complete FM band (71-108МН2) with less then 3V-supply
voltage. The minimum voltage at pin 34 (Усс) should be 2.5V and the maximum voltage 5V. Inside the IC a
chargepump is responsible for delivering the required current to charge/discharge the external loop capacitor.
During the first 9 ms the charge pump delivers a fast current of 50uA. After that this current is reduced to 1uA.
In the given application the typical tuning voltage is between 0.54V (2*108MHz) and 1.57У (2%87.5МН2).
The minimum voltage to frequency ratio, often referred to VCO conversion factor (Kyco), is thus about
40MHZ/V. The oscillator circuit is designed such that the tuning voltage is between 0.2V and У.,-0.2У. In order
to match the VCO tuning range two serial coils L2 and L3 are put in parallel with the tuning diodes D1 and D2.
A typical FM oscillator-tuning curve, using BB202 tuning diodes, is given in
Figure 29.
40
(pF)
30
20
0
0.1 1 10
Ма (V)
Figure 28 Diode capacitance as function of reverse voltage; typical values
The inductance value of the oscillator coils L2 and L3 is about 33nH (0=40 to 45). The inductance is very
critical for the VCO frequency range and should have a low spread (296). The quality factor Q of this coil is
important for a large S/N ratio figure. The higher the quality factor the lower the noise floor VCO contribution
at the output of the demodulator will be. With a quality factor between 40-45 a good compromise can be found
between the size of the coil and the, by the oscillator determined, noise floor.
DRAFT 36
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 PEE 2”
Figure 29 typical oscillator tuning curve of proposed FM application
6.3 Reference frequency
The ТЕА5767/68 can work with two crystal clocks: 13MHz or 32768 Hz. The synthesiser can also be clocked
with 6.5MHz via the Xtal2 pin. It is also possible to use an external 32768Hz, а 6.5MHz ога 13MHz reference
signal. This can be connected via the Xtal2 pin.
6.3.1 Internal clocking
Figure 30 gives a possible connection of the crystal clocks to the tuner.
C,
TEA5767HN Xtal2 ши ТЕА5767НМ Сан
|| Xtal2
17 | 17 Ре
Хам _ || | Жан
16 Е || | | N 16 шан
ри
13МН2 32768Н2
Figure 30 connection of the 13MHz and 32768Hz crystal to the tuner
When using a 13MHz crystal clock this should have a frequency deviation of +20 ppm. Its shunt capacitance
must not exceed 4.5pF and the series resistance is maximal 1000. The temperature drift should be in the order
of +30 ppm over a temperature range of —40°С to +85°С.
DRAFT 37
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
In the ТЕА5767НХ and TEA5768HL demo boards а 13МН2 crystal oscillator is used. This is а surface mount
type, NX4025GA. The specifications of this crystal are given in Table 5.
Nominal frequency 13MHz
Overtone Fundamental
Frequency Tolerance + 10 ppm at 2543°C
Temperature characteristics +15 ppm (-30 ~ +85°C) For mobile communication equipment
( in reference to +25° C ) +15 ppm (-10 ~ +60°C) for computer, OA product
Pull Capacitance 7 ppm /pF (at 13pF) Typical
Equivalent Series Resistance 600.
Drive Level 10uW (100uW max)
Standard Load Capacitance 13pF
Operable Temperature Range -30 ~ +85°С
Table 5: specification of NX4025GA 13MHz crystal
The choice of 32768Hz reference frequency makes it possible to use a cheap 32.768kHz watch crystal. A
drawback of these clocks 15 that they have a very high second order temperature coefficient. This may result in
de-tuning the radio or a search action may fail.
Care should be taken when using this crystal. The accuracy of the 32768Hz crystal can be checked by tuning the
radio to 81.4 MHz with high/low side injection and reading the IF via the bus. The IF must be 37Hex.
An other issue when using this crystal is the grid position. It is not possible to create a 100kHz grid position, but
98.304kHz (3%32768Н2). This should not be a problem if this is resolved in software.
The motional capacitance of the 32768Hz crystal should be between 1.5fF and 3fF. Shunt capacitance must be
max 3.5pF. The series resistance should not exceed 75KOhm.
Further, the frequency accuracy of this crystal must not exceed +20 ppm, while the temperature drift should be
in the order of +50 ppm over a temperature range of —10°C to +60°C.
6.3.2 Pulling and compensation
The 13MHz crystal can be pulled using a proper capacitor (C,, at pin 16 in Figure 30). A capacitor can also
used to compensate the clock (Стр at pin 17 in Figure 30). In our application with XN4025GA, Сш
Is equal to ЇрЕ.
The 32768Hz clock should not be pulled. If necessary, a compensation capacitor can be added as given in
Figure 30.
6.3.3 External referance
The TEA5767HN can be clocked externally with 32768Hz, a 6.5MHz or а 13MHz reference signal. This can be
connected via the Xtal2 pin. Xtall (pin 16) stays open.
DRAFT 38
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
The external signal should be a square wave with a duty cycle of 20 a 80%. The connection of a 13Mhz external
signal 18 given in Figure 31.
Pin 17
Max. voltage f-13MHz,
200MV ing duty cycle: 80/20%
Figure 31 connection of 13Mhz external signal
Figure 32 ilustrate the connection of a 32768Hz external signal to the TEA5767HN.
Pin 17
Max. voltage f=32768Hz,
200mV,... duty cycle: 80/20%
Figure 32: connection of 32768Hz external signal
6.4 Layout Hints
It's important to keep the track between the oscillator coils and рта and 4 of the TEA5767HN (ріп 2 and 3 for
TEAS5768HL) as short as possible. Each millimetre track adds 1nH extra inductance to the wanted inductance
value. This may influence the tuning range and can also lead to wrong oscillation frequencies. For the same
reason it's also important to have a short return track (ground) which has also some isolation between OSC
ground and RF ground.
Any additional current must be kept away from the loop filter and VCO signal pad.
АП other ground pins should be connected to the groundplane. It is preferable to have groundplanes on both
PCB sides. Use as much as possible ground vias for lowest groundplane impedance. To get the highest possible
quality factor it's important to connect the top of the coil to the signal track. No groundplane should be used
below the coils.
DRAFT 39
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
7 RDS/RBDS
The FM stereo radio can be extended with a RDS/RBDS function. Тһе SAA6588 is a one-chip solution with a
combined RDS/RBDS demodulator/decoder. The supply voltage is specified between 4.5V and 5.5V. This
supply voltage 18 necessary to guarantee all specifications.
The motherboard developed for the TEA5767/68 is ready to be supplied with the 5А А 6588 chip.
The input signal for the RDS/RBDS demodulator 18 supplied by the TEA5767/68 radio IC via the MPX output
signal. This signal is available at pin 25 for the TEA5767HN and pin 20 for ТЕА5768 НГ. The MPX output has
high impedance so that it can not directly connected to the RDS input. In the motherboard this signal 1s first
buffered via a transistor (BC859B) and then connected to the RDS chip. Further a low pass filter is used to
remove undesired IF components from the MPX signal.
In the next sectionSA А6588 is briefly described.
7.1 RDS/RBDS with SAA6588
The RDS/RBDS pre-processor SAA6588 is a CMOS device that integrates all relevant functions in one chip.
The pre-processed RDS/RBDS information is available via the 'C-bus. The demodulator of the SAA6588T
contains a band pass filter with a centre frequency of 57 kHz. This filter extracts the RDS/RBDS sub-band from
the MPX signal. This signal will then be digitised for further processing by the digital demodulator. This will
perform symbol decoding, block synchronisation, error detection and error correction.
The SAA6588 has also additional detectors for multi-path, signal quality and audio signal pauses. In this
application, these detectors аге not used. The block diagram of the SAA6588 concept 15 given in Figure 33.
SAA6588
| DC
‚ МРХ demodulator
|
|
|
|
: +
|
|
|
|
decoder
Figure 33 connection diagram of the SAA6588
The pre-processor of the SAA6588 handles the complete processing and decoding stream from the demodulator.
The SAA6588 has different data processing modes, which are software programmable via the bus.
For further information about the SAA6588 a data sheet (SAA6588) and an application note (AN99005) аге
available.
DRAFT 40
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
8 AUDIO AMPLIFIER
The audio output level of the TEA5767/68 radio IC is not sufficient to directly drive a speaker or headphone. А
digital volume control is also not available. The Philips Semiconductors audio group has developed an audio
amplifier for small sized and low power applications. This IC is called TDA7053 and is available is 5016 or
DIP16 package. In the proposed application this amplifier is used. This stereo audio amplifier can deliver 2 x
0.125W BTL into 160 load using a 5V-power supply. А Missing Current Limiter (MCL) is build-in. This
circuit is activated when the difference in current between the output terminal of each amplifier exceeds 100
mA. This level of 100mA allows for headphone applications (single-ended)
The TDA7053 has а DC volume control. In order to control the volume of this amplifier via software a digital to
analogue converter (DAC) is necessary. For this purpose a simple 4-bits DAC 15 used which is constructed by
means of resistors. To make the volume control independent of the supply voltage, HEFA066BT is used asa
switching device. This IC has four independent bilateral switches and now the resistors can be connected to a
stabilised voltage (see Figure C1, Appendix C).
Using the demo software four volume control signals can be generated direct with the Dual Single Master
interface (PR37156). Each pin can be set to a logic “1” or “0”. These signals are connected to the DAC, which
will delivers a DC signal. This voltage is maximal (1.2V) when the four DAC inputs are low (Bit 0-0, Bit 1-0,
Bit 2-0, Bit 3-0). In case these signals are high the DAC output will be minimal (0.60V) (see Table 6). The
DAC output 15 directly connected to the DC volume control 1 and 2 of the amplifier.
The maximum gain of the amplifier is 40.5 dB (the control range is 73.5dB typical) and can be selected between
-33dB and 40dB with DC volume control 1 and 2 at pin 2 and 8.
DC volume control % (Volt) | Gain (dB)
Table 6 Volume control
DRAFT 41
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
g АМ10133
9 INSTALLATION GUIDE
An evaluation demo package will contain the following boards and cables
- Dual Single Master 3Wire/I2C interface PR37156 (parallel printer port interface!)
- motherboard PR73002
- one of the following modules TEA5767HN, ТЕА5767НГ, or TEA5768HL demo board
- two times (0.5 meter) four wire flatcable (1 on 1)
- one time (0.5 meter) nine wire flatcable (1 on 1)
- one time (1 meter) three wire flatcable with black, green and red supply connector
The next paragraphs explain how to install the hardware and software in order to demonstrate the operation of
the tuner board.
9.1. Hardware
Figure 34 gives an overview of the board's interconnection.
PC PARALLEL
PORT
GND
+2.7У
45V
MPX
Audio L
Audio R
Amp Audio
=== — --- р АМТЕММА
Figure 34 connection of TEA5767/68 demo board
The installation procedure is the same for the three boards and can be performed as follow:
e Place the FM Stereo demo board on to the motherboard PR73002 at position P2, P3 and P4 as shown in
Figure 34 and Figure 35 at positions P2, P3 and РА.
e Connect the motherboard PR73002 with 3 separate cables to the ’C-interface PR37156
(P5, P6 and P7 of PR73002 to respectively P2, P1 and P3 of PR37156)
e Connect the supply voltage cable to P8 of PR73002, the red banana plug to a voltage source of +5У, the
green plug to a voltage source of --2.7У and the black one to ground.
e Connect the sub-d 25 pins connector of PR37156 to a free parallel port (LPT) of a PC.
e Connect a FM antenna to the SMB connector P1 of the demo board.
e Connect an audio amplifier or any other measurement device to one of the audio output connectors P10,
P11, P9 (Audio L, Audio R, MPX) or a headphone to P12 (Amp Audio).
DRAFT 42
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68
e Start the control program TEA5767, as explained in $9.2.
Application Note
АМ10133
In Figure 35 is the interconnection between the DSM bus interface and the motherboard given
Black= Ground
Green= 2.5-3V
PC Red=5V
PARALLEL INTERFACE
3 > Р2
a оо = е О
5 |Р8 Р9 | МРХ
FLATCABLE 25 Ф
WIRE
© E P11 | Audio А
ЕГІСТІ g | P»
25-PINS SUB-D CONNECTOR E 5
2 9 Р10 | Audio L
= Рб Оосоооооо
Ё
5 = РА
5 =
DUAL Ё 5
MASTER 9 m P12 |Amp Audio
РС 5
INTERFACE P! 5 5 MOTHERBOARD
PR37156 5 9 Р5 PR73002
са
Ш
P3 Р2 | 2 4 5
Optional SW1/SW2 || SCL/SDA = Р7
N
4
Figure 35 connection of the DSM interface to the motherboard
NOTES:
Make or check the interconnection according to the schematic drawn below. The demo boards should work at 2.7V and the
РС, the amplifier and the RDS decoder at 5V.
All cables should be connected between DSM interface and motherboard. The software will automatically detect whether a
RDS module is present at start-up.
92 Software
Before the software is started please check that the hardware is connected and supplied according to the
interconnection diagram of chapter 9.1. The software program TEA5767 can be used to control the
ТЕА5767НМ, TEA5767HL and ће TEA5768HL, irrespective of the presence of an RDS IC or not.
DRAFT 43
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
This Windows based program is written in Delphi 1.0 and will work with Windows95/98 operating system and
Windows NT
The TEA5767rds.exe file contains also the necessary РС drivers for the operating system. Just start the file and
follow the instruction.
After the installation procedure, the TEA5767 control program can be started. The main window (shown below)
will appear. In the example below the RDS is active.
TEA5767 test program V2.92 with SAA6588 RDS decoder |i IC XI
Г Mute [Г Mute Left Mute Right[ Standby V Bus Enable № I2C mode O [v Update
| SE
| 95.500 м Я- АБТ пао scan |
ој
Area X-tal Бе-Етрһазіз ГГ Port1 0 Гм МЕ
(* Euro © 13MHz (© 50us x Port 2 П г ы
Search Indicator
Cusa | |С 65м | | © 75us Г Hcc
№ High Injection
(С Japan C 32768kHz | FF RDS | ЈУ AuoHi/Lo Г SNC
WRITE data: CO 1D EA DO 00 00
r-Data byte 1— —1-Data byte 2— Data byte 3— т Data byte 4— т Data byte 5 |
ГТТТІМММТММММГМГМГММТ МГТТТТТТТТТТТТТТТТТТТГГ
READ data; C1 9D EA BS FO 00 Level 15 IF counter: 38
граѓа byte 1— —7-Data byte 2——7 Data byte 3——— Data byte 4— т Data byte 5
v [УУ ІМІМММГ м Мм МММ “МММ
[ЕМЭО8ЕМ [ese ux [ ке | [| ||
RADIO ЗЕМ PROGRAMMA ZUID-O00ST BRABANT WWW. RADIOSFM.NL
The program will automatically detect the presence of the RDS module. Тһе main window contains now ап
extra part (the two lower lines) reserved for the RDS information. When the PR37001 mother is used without
RDS, the window will only show the upper part and the lower two RDS display lines will be skipped.
The software should be re-initialised when the supply voltage 15 switched on/off during program execution.
This can be done by a double-click on the initialisation button (red circle). The user interface is quite intuitive.
For most of the buttons and functions a short description will show up as soon as the mouse pointer is close to it.
The RDS/RBDS functions are also described, but for those who are not so familiar with RDS/RBDS a short
explanation of the RDS items (shown above) is given:
FM908FM - this is the PS (Program Service Name)
8508 — this is the hexadecimal PI (Program Identification) code
98% — this gives an indication of the RDS/RBDS quality
POP - this is the PTY (Program TYpe) information
STEREO – decoder information from RDS/RBDS (not shown on the display)
MUSIC - the music/speech flag (not shown in the display)
DRAFT 44
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
e EON -this station supports EON (Enhanced Other Networks) (not shown on the display)
e TP — indicates that the actual station can transmit traffic information TP (Traffic Program)
e ТА – when TP is also active: а traffic announcement is active
when ТР is inactive: through EON the radio “knows” where Traffic Announcement can be found
e Example: RADIO 8FM PROGRAMMA ZUID-OOST BRABANT WWW.RADIOSFM.NL - Radio Text
DRAFT 45
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
10 SPECIFICATIONS
The FM radio апа RDS performance is measured оп a few representative demoboards. The characteristics are
only indicative and could definitely not be guaranteed because of the limited number of measured samples. A
typical FM performance curve of the TEA5767HH is given in Figure 36 (see page 47).
10.1 FM radio + RDS characteristics
Condition: У rad-2.7V, Tamb = 25? C, Frun= 98 MHZ, F aey = + 22.5kHz, Е а= 1 kHz
C DIEASISIBNITEASTETHUTEASTGSHL |
83 (Уш. 02V
ЕП;
RDS sensitivity for 100%
Correct blocks f а= £2 kHz
Table 7: FM radio + RDS characteristics
DRAFT 46
Philips Semiconductors
Application Note
AN10133
Low voltage FM stereo radio with TEA5767/68
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Figure 36 FM characteristic of TEA57567HN demo board
47
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 дет 2
APPENDIX A: TEA5767HN DEMO BOARD (НУОҒМ40 FM-ONLY STEREO)
E
Е
в
a
2
SCHEMATIC TEA5767/68HL demo board
48
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX А: TEA5767HN DEMO BOARD
Figure A-2 REFERENCE TOP TEAS5767HN demo board
Figure A-3 SIGNAL TOP ТЕА5767НМ demo board
DRAFT 49
Philips Semiconductors
L Itage FM stereo radio with TEA5767/68 Application Note
СЕ АМ10133
APPENDIX А: ТЕА5767НМ DEMO BOARD
О
О
О
О
О
О
О
Figure А-5 SIGNAL BOTTOM ТЕА5767НХ demo board
DRAFT
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX A: TEA5767HN DEMO BOARD
ет [ar Component | Sees — (тос RATING [VENDOR[GEOMETAY] Ferers |
100n XR7 0603 PHILIPS C1, C2
33n XR7 0603 PHILIPS C10, C11
in XR7 0603 PHILIPS C14
10p NPO 0603 PHILIPS C15
4n7 XR7 0603 PHILIPS C16
Open C17
47n XR7 0603 PHILIPS C19
10n XR7 0603 PHILIPS C20
100p NPO 0603 PHILIPS C3
22n XR7 0603 PHILIPS CA, C5,C12, C21, C22, C23
27p NPO 603 PHILIPS C13
47p NPO 0603 PHILIPS C6
47n XR7 0603 PHILIPS C7, C8, C9
47uF XR7 1812 PHILIPS CP3
BB202 VARICAP 0603 PHILIPS D2, D3
120nH LQW18ANR12J00 0603 muRATA L1
33nH LQW18AN33NG00 0603 muRATA 12,13
АМТ BNC SUB P1
10R RC21 0603 PHILIPS R1
OR RC21 603] PHILIPS R6, R22, R23
33K АС21 0603 РНІШРЅ В16
10К RC21 0603 PHILIPS R20
100k RC21 0603 PHILIPS R21
18K RC12G, TC50 0805 PHILIPS R25
ARRAY. 1х7р |05-88-1136
АВВАҮ 1х7р |05-88-1136
ІСІ HVQFN40 PHILIPS |SOT618 TEA5767HN
13MHz NX4025 NDK хі
го
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о
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№
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14
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со
Figure А-6 BOM list ТЕА5767НМ demo board
DRAFT 51
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68
APPENDIX B: TEA5768HL DEMO BOARD
14
тү
1УмНы
it
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32
Application Note
PHILIPS Semiconductors Hamburg
Figure B-1 SCHEMATIC TEA5767/68HL demo board
DRAFT
AN10133
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX B: TEA5767/68HL DEMO BOARD
Figure B-2 REFERENCE TOP TEAS5767/68HL demo board
Figure B-3 SIGNAL TOP TEA5767/68HL demo board
DRAFT 53
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX В: ТЕА5767/68НІ. DEMO BOARD
IN
I Ww
- ~
©
N Ф
ош
он
Figure В-4 REFERENCE BOTTOM ТЕА 5767/68НІ demo board
Figure B-5 SIGNAL BOTTOM ТЕА5767/68НІ. demo board
DRAFT 54
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX В: TEA5767/68HL DEMO BOARD
Pe [am component | Seres — [ro пятне өвс сонс чт
100n 0603 PHILIPS C1, C2
33n XR7 0603 PHILIPS C10, C11
in XR7 1096/0603 PHILIPS C14
10p NPO 0603 PHILIPS C15
4n7 XR7 0603 PHILIPS C16
1p NPO 606 PHILIPS C17
47n XR7 0603 PHILIPS C19
10n XR7 0603 PHILIPS C20
100p NPO 0603 PHILIPS C3
22n XR7 0603 PHILIPS СА, C5,C12, C21, C22, C23
27p NPO 603 PHILIPS C13
47p NPO 1096/0603 PHILIPS C6
47n XR7 0603 PHILIPS C7, C8, C9
47uF XR7 1812 PHILIPS СРЗ
88202 VARICAP 0603 PHILIPS D2, D3
120nH LQW18ANR12J00 0603 muRATA L1
33nH LQW18AN33NG00 0603 muRATA 12, L3
АМТ BNC SUB P1
10R RC21 0603 PHILIPS R1
OR RC21 603 PHILIPS R6, R22, R23
33K RC21 0603 PHILIPS R16
10k RC21 0603 PHILIPS R20
100k RC21 0603 PHILIPS R21
18K RC12G, TC50 0805 PHILIPS R25
ARRAY 1х7р |05-88-1136
ARRAY 1х5р |05-88-1136
ІСІ LQFP32 PHILIPS |SOT358 TEA5768HL
13MHz NX4025 NDK xi
с омо | 011- (со |М1-
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Figure B-6 BOM list TEA5767/68HL demo board
DRAFT 55
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX С: PR37002 MOTHER BOARD (WITH TDA7053AT AND SAA6588T)
2002'у Акпиег 'Kepuj :pebueuo eu meg
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эриви әң әці цөлоцрил
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үнде Smig
Figure C: schematic diagram of PR73002 mother board
DRAFT 56
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX D: PR37156 DSM INTERFACE
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таз таноттар иерар Engineer: Philips Semiconductors B.V.
PHILIPS Beunders Eindhoven The Netherlands
1 |
e: SEMICONDUCTORS iiis Sheet Name: PC-IIC-INTERFACE
Changed by:
PS-SLE ын
Time Changed: 1:35:15 рт Project: PR37156
Date Changed: Thursday, April 13, 2000
Figure D: schematic diagram PR37156 DSM (Dual Single Master) interface
DRAFT 57
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX E: COMMUNICATION: WRITE MODE
[ыт р р [ыз р р [ыт ис
[Databyte3 [Searchup/down |Searchstoplevel | | |HiLosideinjection | Мопо/мегео | Мше!ей | Mute right [SW ро! |
[Data — — Е |
Mute 1: L-, R-audio muted
0: Audio not muted
Search node 1: search mode
0: not in search mode
PLL13..PLLO Setting of the synthesizer programmable counter
Search up/down 1: search up
0: search down
Search stop level See table 4 (page 29)
High/low side injection 1: high side LO injection
0: low side LO injection
Mono/stereo 1: forced mono
0: stereo on
Mute left 1: left audio muted and forced mono
0: not muted
Right mute 1: Right audio muted and forced mono
0: not muted
SW port | & SW port 2 1: Port high
0: Port low
Stand-by 1: tuner in stand-by
0: not in stand-by
Band limits (BL) 1: japan FM band
US/Europe FM band
Xtal 1: Fxtal is 32.768kHz
0: Fxtal is 13MHz
Soft_mute 1: On
0: Off
HCC 1: Оп
0: Off
SNC 1: Оп
0: Off
Search indicator 1: pin 14 is output for the ready flag
0: pin 14 is SW port 1
PLL ref 1: 6.5MHz reference for PLL enabled
0: 6.5MHz reference not enabled
Deemph 1: deemphasis time constant is 7505
0: deemphasis time constant is 50us
DRAFT
58
Philips Semiconductors
Low voltage FM stereo radio with TEA5767/68 Application Note
9 АМ10133
APPENDIX Е: COMMUNICATION: READE MODE
[ — Ta; — р р [ыз р ро [ит р |
[Data — — Description |
Ready flag 1: Tuning completed or BL reached
БИБЛИ њу ~ == NT
Band limit flag 1: Band limit reached
pens ваша |
Stereo indication 1: Stereo reception
теми" __| маска _________/
DRAFT 59