Document text
О 0 ۱0۸1
ÁN, SGS-THOMSON
MICROELECTRONICS TDA1220B
AM-FM QUALITY RADIO
The TDA1220B is a monolithic integrated circuit in
a 16-lead dual in-line package.
It is intended for quality receivers produced in large
quantities.
The functions incorporated are:
AM SECTION
— Preamplifier and double balanced mixer
— One pin local oscillator
— IF amplifier with internal AGC
— Detector and audio preamplifier
FM SECTION
— IF amplifier and limiter
— Quadrature detector
— Audio preamplifier
The TDA1220B is suitable up to 30MHz AM and for
FM bands (including 450KHz narrow band) and
features:
— Very constant characteristics (3V to 16V)
— High sensitivity and low noise
— Very low tweet
BLOCK DIAGRAM
(0
LOCAL
OSCILLATOR
á ii RF AMPLIFIER
20
AND MIXER
DIP-16 Plastic
(0.25)
ORDERING NUMBER : TDA 1220BK
— Sensitivity regulation facility (*)
— High recovered audio signal suited for stereo
decoders and radio recorders
— Very simple DC switching of AM-FM
— Low current drain
— AFC facility
(*) Maximum AM sensitivity can be reduced by means of a resistor
(5 to 12КО) between pin 4 and ground.
BH AMPUPER
| LIMITER
March 1993
1/18
TDA1220B
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vs Supply voltage 16 V
Ри Total power dissipation at Tamb < 110°C 400 mW
Top Operating temperature -20 to 85 °C
Тада, Tj Storage and junction temperature -55 to 150 °C
PIN CONNECTION
(Top view)
LOCAL
OSCILLATOR
AM INPUT
MIXER OUT
AMPLIFIED
AGG (BYPASS)
AM IF INPUT
AM DETECTOR [|6
BYPASS
AM DETECTOR|| 7
AGC (BYPASS) || 8
16|| IF FM INPUT
IF FM BYPASS
(РЕМ BYPASS
13||FM DETECTOR
12 ||ЕМ ОЕТЕСТОВ
GROUND
Ws
AF OUTPUT
THERMAL DATA
Symbol Parameter Value Unit
Rin-j-amb Thermal resistance junction-ambient 100 °C/W
2/18 8
ky 905 THOMSON
TDA1220B
ELECTRICAL CHARACTERISTICS (Tamb = 25 °C, Vs = УМ unless otherwise specified, refer to test circuit)
Symbol Parameter Test conditions Min. Typ. Max. Unit
Vs Supply voltage 3 16 V
0 Drain current FM 10 15 mA
AM 14 20 mA
AM SECTION (fo = 1 MHz; ћу = KHz)
Vi Input sensitivity S/N = 26 dB m = 0.3 12 25 uV
S/N Vi=10 mV m=0.3 45 52 dB
Vi AGC range AVout = 10 dB m=0.8 94 100 dB
Vo Recovered audio signal Vi21mV m = 0.3 80 130 200 mV
(pin 9)
: i = 0. 4 1 9
d Distortion Vi=1mV m=0.3 0 %
т = 0.8 1.2 %
Мн Max input signal handling m = 0.8 d « 10% 1 V
capability
Ri Input resistance between m=0 7.5 ко
pins 2 and 4
Ci Input capacitance between | т - 0 18 pF
pins 2 and 4
Ro Output resistance (pin 9) 4.5 7 9.5 ко
4 B
Tweet 2 IF TRU Vici mV 0 d
Tweet 3 IF 55 dB
FM SECTION (fo = 10.8 MHz; fm = 1 KHz)
Vi Input limiting voltage -3 dB limiting point 22 36 uV
AMR Amplitude modulation Af = +22.5 KHz m=0.3 40 50 dB
rejection Vi =3 mV
S/N Ultimate quieting Af = +22.5 KHz Vi21mV 55 65 dB
d Distortion Af = +75 KHz Vi= ту 0.7 1.5 96
Di | 0.25 0.5 %
| ee Af = 422.5 KHz М = 1 ту à
d Distortion (double tuned) 0.1 96
Vo Recovered audio signal Af = +22.5 KHz Vi 21 mV 80 110 140 mV
(pin 9)
Ri Input resistance between 6.5 ко
pin 16 and ground
Ci Input capacitance between 14 pF
pin 16 and ground
Ro Output resistance (pin 9) 4.5 7 9.5 Ко
Ger SGS-THOMSON 3/18
ad MICROELECTRONICS
TDA1220B
Figure 1. Test circuit
P Ak
22Kn ! !
CL C,
(1-2)57 turns
i 5 (2-3)116 turns
(4-6) 24turns
5-5367/2
J
TOKO KACS K586 HM
KACS
K586- HM
о О
ЕМ АМ
1.0. n.n. n.n n D
TDA 1220B
Uuuuuuutr
R8 f
RWO L AUDIO
646574 - Q
MURATA |
SE CPZ
e Hi
4/18 а
ky SOS THOMSON
TDA1220B
Figure 3. Audio output, noise
and tweet levels vs. input
signal (AM section)
а H 0 102 10? w
еу)
Figure 6. Audio output and
noise level vs. input signal (FM
section)
dB
DH
19-107MH2
35 tm: KHz :
| 11-222 окна
dos
Figure 9. Amplitude modu-
lation rejection vs. input signal
(FM section)
BEDA
(98) ре“ ое
= 10.7MHz !
АНИ те «KHz 1 ||
i DEELER ||:
[|| At + 22.5КН2
T
SS
=
1
1
Figure 4. Distortion vs. input
signal and modulation index
(AM section)
fo: IMHz
fmz KHz
Уз=9У
Т
-H
Figure 7. Distortion vs. input
signal (FM section)
d
Ch)
! g
Figure 10. A DC output voltage
(pin. 9) vs. frequency shift (FM
section)
-200
- 400 |
-120 -80 -40 0 40
80 ét(KHz)
Figure 5. Audio output vs.
supply voltage (AM section)
Figure 8. Audio output vs.
supply voltage (FM section)
"Помолмнх |
dmz 2
At=t22.5KHz
10 Ys V)
Figure 11. A DC output voltage
(pin 9) vs. ambient
temperature (FM section)
5/18
Дуу SGS-THOMSON
TDA1220B
APPLICATION INFORMATION
AM Section
RF Amplifier and mixer stages
The RF amplifier stage (pin 2) is connected directly to the secondary winding of the ferrite rod antenna or
input tuned circuit. Bias is provided at pin 4 which must be adequately decoupled. The RF amplifier provides
stable performance extending beyond 30 MHz.
The Mixer employed is a double - balanced multiplier and the IF output at pin 3 is connected directly to the
IF filter coil.
Local oscillator
The local oscillator is a cross coupled differential stage which oscillates at the frequency determined by the
load on pin 1.
The oscillator resonant circuit is transformer coupled to pin 1 to improve the Q factor and frequency stability.
The oscillator level at pin 1 is about 100 mV rms and the performance extends beyond 30 MHz, however
to enhance the stability and reduce to a minimum pulling effects of the AGC operation or supply voltage
variations, a high C/L ratio should be used above 10 MHz.
An external oscillator can be injected at pin 1. The level should be 50 mV rms and pin 1 should be connected
to the supply via a 100W resistor.
IF Amplifier Detector
The IF amplifier is a wide band amplifier with a tuned output stage.
The IF filters can be either LC or mixed LC/ceramic.
AM detection occurs at pin 7. A detection capacitor is connected to pin 6 to reduce the radiation of spurious
detector products.
The Audio output is at pin 9 (for either AM or FM); the IF frequency is filtered by an external capacitor which
is also used as the FM mono de-enphasis network. The audio output impedance is about 7КО and а high
impedance load (~ 50KO) must be used.
AGC
Automatic gain control operates in two ways.
With weak signals it acts on the IF gain, maintaining the maximum S/N. For strong signals a second circuit
intervenes which controls the entire chain and allows signal handling in excess of one volt (m = 0.8).
At pin 8 there is a carrier envelope signal which is filtered by an external capacitor to remove the Audio and
RF content and obtain a mean DC signal to drive the AGC circuit.
6/18 А
ky 905 THOMSON
TDA1220B
APPLICATION INFORMATION (continued)
FM Section
IF Amplifier and limiter
The 10.7 MHz IF signal from the ceramic filter is amplified and limited by a chain of four differential stages.
Pin 16 is the amplifier input and has a typical input impedance of 6.5 KW in parallel with 14 pF at 10.7 MHz.
Bias for the first stage is available at pin 14 and provides 10096 DC feedback for stable operating conditions.
Pin 15is the second inputto the amplifier and is decoupled to pin 14, which is grounded by a 20 nF capacitor.
An RLC network is connected to the amplifier output and gives a 90? phase shift (at the IF centre frequency)
between pins 13 and 12. The signal level at pin 13 is about 150 mV rms
FM Detector
The circuit uses a quadrature detector and the choise of component values is determined by the acceptable
level of distortion at a given recovered audio level.
With a double tuned network the linearity improves (distortion is reduced) and the phase shift can be
optimized; however this leads to a reduction in the level of the recovered audio. A satisfactory compromise
for most FM receiver applications is shown in the test circuit.
Care shoul be taken with the physical layout.
The main recommandations are:
* Locate the phase shift coil as near as possible to pin 13.
e Shunt pins 14 and 16 with a low value resistor (between 560 and 3300).
e Ground the decoupling capacitor of pin 14 and the 10.7 MHz input filter at the same point.
AM-FM Switching
AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference.
Typical DC voltages (refer to the test circuit)
Pins| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | Unit
AM 9 1.4 9 14 14 4 9 0.7 1.9 9 0 01 01 85 85 8.5 V
FM 9 002 9 002 002 85 9 0 1.7 9 0 9 9 8 8 8 V
а 7/18
ky 905 THOMSON
TDA1220B
APPLICATION SUGGESTION
Reccomended values are referred to the test circuit of Fig. 2.
Part Recommended Purpose Smaller than Larger than
number value p recommended value recommended value
C1 100 ЦЕ AGC bypass Increase of the distortion | Increase of the AGC time
at low audio frequency constant
C2 (*) 100 nF AM input
DC cut
СЗ (*) 10 nF FM input
DC cut
C4 20 nF FM amplifier bypass Reduction of sensitivity - Bandwidth increase
C5 20 nF — Higher noise
C6 68 pF Ceramic filter coupling IF bandwidth reduction IF bandwidth increase
C7 100 nF FM detector decoupling Danger of RF irradiation
C8 100 nF Power supply bypass Noise increase of the
audio output
C9 10 ЦЕ AGC bypass Increase of the distortion | Increase of the AGC time
at low audio frequency constant
C10 (*) 56 pF Tuning of the AM
oscillator at 1455 KHz
C11 6.8 nF 50 us
FM de-enphasis
C12 100 nF Output DC Low audio frequency cut
decoupling
C13 220 ЦЕ Power supply Increase of the distortion
decoupling at low frequency
C16 2.7 nF AM detector capacitor Low suppression of Increase of the audio
the IF frequency and distortion
harmonics
R1 (*) 68 ohm FM input matching
R2 (*) 56 ohm AM input matching
R3 330 ohm Ceramic filter matching Audio output decrease
and lower distortion
R4 8.2 Kohm FM detector Audio output decrease Audio output increase
coil Q setting and higher AMR and higher distortion
R5 560 ohm FM detector Lower IF gain and Lower
load resistor AGC range
R6 82 Kohm AM detector Higher IF gain and lower
coil Q setting AGC range
R7 2.2 Kohm 455 KHz IF filter
matching
R8 3.3 Kohm 455 KHz IF filter
matching
(7) Only for test circuit
8/18
SGS-THOMSON و
MICROELECTRONICS
TDA1220B
continued)
(
APPLICATION INFORMATION
Figure 12. Portable AM/FM radio
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MICROELECTRONICS
SGS-THOMSON و
TDA1220B
APPLICATION INFORMATION (continued)
Figure 13. PC board and component layout of the fig. 12 1 : 1 scale
SPEAKER
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10/18 d
Дуу SES THOMSON
TDA1220B
APPLICATION INFORMATION (continued)
F1 - 10.7 MHz IF Coil
CX RN eg TURNS
н L— ^ | (MHz)
i = 1-3 1-2 2-3 4-6
١ 6) TOKO - FM1 - 10x10 mm.
= 10.7 110 6 8 2 154 AN - 7A5965R
F3 and F5 - 455 KHz IF Coil
Qo TURNS
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Sr
А
ТОКО - АМЗ - 10x10 mm. 48 .| 89 1-2-1 پل
RLC - 4A7525N 24 | 16 57 70
OQ
g
=
со
о
A
сл
сл
Е4 - FM Detector Coil
(4) (pb) , Qo TURNS
Q JF’ | (KHz)
bs 158 18 E Е ТОКО - 10х10 тт.
(6) 82 10.7 100 12 = = KACS - К586 HM
F6 - AM Oscillator Coil
3 TOKO - 10x10 mm.
(1) (6) 796 | 220 | 8 | 2 | 75 | 8 RWO + 6A6574N
(4) Р L Qo TURNS
1-3 | 12 | 23 | 46
= a = om
L5 - Antenna Coil
L
кы em "۹ TURNS
1-2 1-2 1-2 3-4 WIRE: LITZ - 15x0.05 mm.
CORE: 10x80 mm.
796 105 7
Á SGS-THOMSON 11/8
ad MICROELECTRONICS
TDA1220B
APPLICATION INFORMATION (continued)
Typical performance of the radio receiver of fig. 12 (Vs = 9V)
Parameter Test Conditions Value
7.5 to 108 MH
WAVEBANDS FM 87.5 to 108 2
AM 510 to 1620 KHz
FM | S/N - 26dB Af = 22.5KHz 1 pV
SENSITIVITY AM |S/N- 6dB m - 0.3 1м
AM | S/N = 2688 m - 0.3 10 pV
Af = 22.5KH 0.25%
DISTORTION А -
Af 75КН 0,7%
(fm = 1KHz) SE °
=0.3 0.4%
AM | Vi- 100 uV 4 :
т = 0,8 0,8%
Ро = 0.5W
ЕМ Af = 22.5KHz 64 dB
SIGNAL TO NOISE Vi = 100 uV
(fm = 1KHz)
Ро = 0.5W
AM bi m = 0.3 50 dB
V 1 ту
AMPLITUDE
MODULATION FM | Vi- 100 pV Af222.5KHz m=0.3 50 dB
REJECTION
2nd H. | f2 911 KHz 0.3%
TWEET
3rd H. | f = 1370 KHz 0.07%
QUIESCENT CURRENT 20 mA
SUPPLY VOLTAGE RANGE 3 to 12V
12/18 Á SGS-THOMSON
ad MICROELECTRONICS
TDA1220B
APPLICATION INFORMATION (continued)
Figure 14. Low cost 27 MHz receiver
MURATA CF2 455F
ce
1 Pr Tor
1
Figure 15. L2 Oscillator coil Figure 16. L1 Antenna Coil
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Coil support: Токо 10K | .
Primary winding: 10 Turns of enamelled cop- Coil support: Тозе 10K 1
per wire 0.16 mm diameter (pins 3-1). Primary winding: ې L2 (pins 3-1) .
Secondary winding: 4 Turns copper wire Secondary winding: 2 Turns copper wire
0.16 mm diameter (pins 6-4) 0.16 mm diameter (pins 6-4)
Figure 17. Low cost 27 MHz receiver with external xtal oscillator
MURATA CF2 455F | 930 «02v
FROM
EXT OSCILLATOR
(50 +100 mV, ms)
Ko SGS-THOMSON 13/18
MICROELECTRONICS
TDA1220B
APPLICATION INFORMATION (continued)
Figure 18. 455 KHz FM narrow band IF
L1 = ТОКО OAM 320
L2= TOKO OAM 320
СЗ: TOKO OAM 120
L4 = ТОКО СОК FORM 7PA -200 TURNS @ 8
Figure 18. P.C. board and component layout of the circuit of fig. 18
Hu GND
Si 82
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ESCE) pnis La. i ee
ТрА1220 cord سینا
Ө 10 1177 177 7
-0188
О
INPUT
14/18 8
ky 905 THOMSON
TDA1220B
APPLICATION INFORMATION (continued)
Figure 20. Discriminator "S" curve response (circuit of fig. 18)
20 mV /div
8 KHz/div
Figure 21. Application in sound channel of multistandard TV or in parallel AM modulated sound
channel (AM section only).
۷ه
Li
Coil form: Токо 10K
N? of Turns: 5 of enamelled
copper wire ф 0.16 وک تت :
ррег уйге g TOKO KACS Ge Ам
K 586 HM
Coil form: Toko 10K 5-6153
N? of Turns: 5*2 of enamelled
copper wire ф 0.16
Суу 565-ТНОМ5ОМ 1918
ad MICROELECTRONICS
TDA1220B
ELECTRICAL CHARACTERISTICS (Vs = 12V)
AM Section (fo = 39MHz; fm = 15KHz)
Parameter Typ Unit
Audio out (m = 0.3) 60 mV
S/N (Vi2100mV; т = 0.3) 37 dB
S/N (Vi=1mV; m - 0.3) 55 dB
S/N (М: = 10mV; m - 0.3) 56 dB
AGC range (m = 0.8, AVout = Зав) 65 dB
Max input signal handling (m = 0.8; d = 5%) 150 mV
— 3dB bandwidth 600 KHz
Distortion (Vi=100 uV; т = 0.3) 2 %
(Vi = 1mV; m - 0.3) 1 96
(Vi = 10mV; m - 0.3) 0.8 926
(Vi2100uV; m=0.8) 7 Kä
(Vi = 1mV; m - 0.8) 5 Kä
(Vi = 10mV; m - 0.8) 3 Kä
FM Section (fo = 5.5MHz; fm = 1KHz)
Parameter Typ Unit
—3dB input limiting voltage (Af 2 25KHz) 3 uV
AMR (Af = +25КН2; m = 0.3; Vi = 100 uV) 40 dB
(Af = +25KHz; m = 0.3; Vi = 1т\/) 58 dB
(Af = +25КН2; т = 0.3; М = 10mV) 54 dB
S/N (Af = +25KHz; Vi = 100 uV) 51 dB
S/N (Af = +25KHz; Vi=1 ту) 70 dB
S/N (Af = +25KHz; Vi = 10mV) 70 dB
Distortion (Af = +25KHz; Vi = 100 uV) 0.5 %
(Af = +25KHz; Мес 1 mV) 0.6 926
(Af = +25KHz; Vi = 10 mV) 0.6 %
(Af = +50KHz; Vi = 100 uV) 1 %
(Af = +50KHz Vi 2 1mV) 1 %
(Af = +50KHz; Vi = 10mV) 1 %
Recovered audio (Af = +15KHz; Vi = 1 mV) 70 mV
Recovered audio can be varied by variation of 3.3K ohm resistor in parallel with
the discriminator coil)
Max input signal handling 1 V
Note: AM performance at 39MHz can be improved by mean of a selective preamplifier stage.
16/18 و SGS-THOMSON
MICROELECTRONICS
TDA1220B
DIP16 PACKAGE MECHANICAL DATA
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
al 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
| 5.1 0.201
L 3.3 0.130
2 127 0.050
SGS-THOMSON Аё و
MICROELECTRONICS
TDA1220B
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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18/18 £r SGS-THOMSON
MICROELECTRONICS