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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
ORDERING NUMBER : TDA 1220BK
DIP-16 Plastic (0.25)
- 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 12K) between pin 4 and ground.
BLOCK DIAGRAM
March 1993
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ABSOLUTE MAXIMUM RATINGS
Symbol Vs Ptot Top Tstg, Tj Supply voltage Total power dissipation at Tamb < 110C Operating temperature Storage and junction temperature Parameter Value 16 400 -20 to 85 -55 to 150 Unit V mW C C
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Rth-j-amb Parameter Thermal resistance junction-ambient max Value 100 Unit C/W
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ELECTRICAL CHARACTERISTICS ( Tamb = 25 C, Vs = 9V unless otherwise specified, refer to test circuit)
Symbol Vs Id Parameter Supply voltage Drain current FM AM AM SECTION (fo = 1 MHz; fm = KHz) Vi S/N Vi Vo d AGC range Recovered audio signal (pin 9) Distortion Input sensitivity S/N = 26 dB Vi = 10 mV Vout = 10 dB Vi = 1 mV m = 0.3 m = 0.3 m = 0.8 m = 0.3 m = 0.3 m = 0.8 VH Ri Ci Ro Max input signal handling capability Input resistance between pins 2 and 4 Input capacitance between pins 2 and 4 Output resistance (pin 9) Tweet 2 IF Tweet 3 IF FM SECTION (fo = 10.8 MHz; fm = 1 KHz) Vi AMR S/N d d d Vo Ri Ci Ro Input limiting voltage Amplitude modulation rejection Ultimate quieting Distortion Distortion Distortion (double tuned) Recovered audio signal (pin 9) Input resistance between pin 16 and ground Input capacitance between pin 16 and ground Output resistance (pin 9) 4.5 f = 22.5 KHz Vi = 1 mV 80 -3 dB limiting point f = 22.5 KHz Vi = 3 mV f = 22.5 KHz f = 75 KHz f = 22.5 KHz m = 0.3 Vi = 1 mV Vi = 1 mV Vi = 1 mV 40 55 22 50 65 0.7 0.25 0.1 110 6.5 14 7 9.5 140 1.5 0.5 36 V dB dB % % % mV K pF K m = 0.3 Vi = 1 mV m = 0.8 m=0 m=0 4.5 d < 10% 1 7.5 18 7 40 55 9.5 45 94 80 12 52 100 130 0.4 1.2 200 1 25 V dB dB mV % % V K pF K dB dB Test conditions Min. 3 10 14 Typ. Max. 16 15 20 Unit V mA mA
Vi = 1 mV
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Figure 1. Test circuit
Figure 2. PC board and component layout (1:1 scale) of the test circuit
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Figure 3. Audio output, noise and tweet levels vs. input signal (AM section) Figure 4. Distortion vs. input signal and modulation index (AM section) Figure 5. Audio output vs. supply voltage (AM section)
Figure 6. Audio output and noise level vs. input signal (FM section)
Figure 7. Distortion vs. input signal (FM section)
Figure 8. Audio output vs. supply voltage (FM section)
Figure 9. Amplitude modulation rejection vs. input signal (FM section)
Figure 10. DC output voltage (pin. 9) vs. frequency shift (FM section)
Figure 11. DC output voltage (p i n 9) vs. amb ien t temperature (FM section)
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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 7K and a high impedance load (~ 50K) 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.
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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 100% DC feedback for stable operating conditions. Pin 15 is the second input to 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. * Shunt pins 14 and 16 with a low value resistor (between 56 and 330). * 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 AM FM 1 9 9 2 1.4 0.02 3 9 9 4 1.4 0.02 5 1.4 0.02 6 8.4 8.5 7 9 9 8 0.7 0 9 1.9 1.7 10 9 9 11 0 0 12 0.1 9 13 0.1 9 14 8.5 8 15 8.5 8 16 8.5 8 Unit V V
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APPLICATION SUGGESTION Reccomended values are referred to the test circuit of Fig. 2.
Part number C1 C2 (*) C3 (*) C4 C5 C6 C7 C8 C9 C10 (*) C11 C12 C13 C16 Recommended value 100 F 100 nF 10 nF 20 nF 20 nF 68 pF 100 nF 100 nF 10 F 56 pF 6.8 nF 100 nF 220 F 2.7 nF Purpose AGC bypass AM input DC cut FM input DC cut FM amplifier bypass Ceramic filter coupling FM detector decoupling Power supply bypass AGC bypass Tuning of the AM oscillator at 1455 KHz 50 s FM de-enphasis Output DC decoupling Power supply decoupling AM detector capacitor Low audio frequency cut Increase of the distortion at low frequency Low suppression of the IF frequency and harmonics Increase of the audio distortion Reduction of sensitivity IF bandwidth reduction Danger of RF irradiation Noise increase of the audio output Increase of the distortion at low audio frequency Increase of the AGC time constant - Bandwidth increase - Higher noise IF bandwidth increase Smaller than recommended value Increase of the distortion at low audio frequency Larger than recommended value Increase of the AGC time constant
R1 (*) R2 (*) R3 R4 R5 R6 R7 R8
(*) Only for test circuit
68 ohm 56 ohm 330 ohm 8.2 Kohm 560 ohm 82 Kohm 2.2 Kohm 3.3 Kohm
FM input matching AM input matching Ceramic filter matching FM detector coil Q setting FM detector load resistor AM detector coil Q setting 455 KHz IF filter matching 455 KHz IF filter matching Audio output decrease and lower distortion Audio output decrease and higher AMR Lower IF gain and Lower AGC range Higher IF gain and lower AGC range Audio output increase and higher distortion
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APPLICATION INFORMATION (continued) Figure 12. Portable AM/FM radio
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APPLICATION INFORMATION (continued) Figure 13. PC board and component layout of the fig. 12 1 : 1 scale
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APPLICATION INFORMATION (continued)
F1 - 10.7 MHz IF Coil
Co (pF) - - 10.7 f (MHz) Qo 1-3 110 1-2 6 TURNS 2-3 8 4-6 2 TOKO - FM1 - 10x10 mm. 154 AN - 7A5965R
F3 and F5 - 455 KHz IF Coil
Co (pF) 1.3 180 455 f (KHz) Qo 1-3 70 1-2 57 TURNS 2-3 116 4-6 24 TOKO - AM3 - 10x10 mm. RLC - 4A7525N
F4 - FM Detector Coil
Co (pF) 1.3 82 10.7 f (KHz) Qo 1-3 100 1-3 12 TURNS - - - - TOKO - 10x10 mm. KACS - K586 HM
F6 - AM Oscillator Coil
f (kHz) 796 L (H) 1-3 220 Qo 1-3 80 1-2 2 TURNS 2-3 75 4-6 8 TOKO - 10x10 mm. RWO + 6A6574N
L5 - Antenna Coil
f (KHz) 796 L (H) 1-2 Qo 1-2 TURNS 1-2 105 3-4 7 WIRE: LITZ - 15x0.05 mm. CORE: 10x80 mm.
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APPLICATION INFORMATION (continued) Typical performance of the radio receiver of fig. 12 (Vs = 9V)
Parameter WAVEBANDS FM AM FM SENSITIVITY AM AM FM DISTORTION (fm = 1KHz) AM S/N = 26dB S/N = 6dB S/N = 26dB Po = 0.5W f = 22.5KHz m = 0.3 m = 0.3 f = 22.5KHz f = 75KHz Vi = 100 V Po = 0.5W Vi = 100 V AM AMPLITUDE MODULATION REJECTION TWEET QUIESCENT CURRENT SUPPLY VOLTAGE RANGE Po = 0.5W Vi = 1 mV FM 2nd H. 3rd H. Vi = 100 V f = 911 KHz f = 1370 KHz f = 22.5KHz m = 0.3 50 dB 0.3% 0.07% 20 mA 3 to 12V m = 0.3 m = 0,8 FM f = 22.5KHz Test Conditions Value 87.5 to 108 MHz 510 to 1620 KHz 1 V 1 V 10 V 0.25% 0,7% 0.4% 0,8% 64 dB
SIGNAL TO NOISE (fm = 1KHz)
m = 0.3
50 dB
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APPLICATION INFORMATION (continued) Figure 14. Low cost 27 MHz receiver
Figure 15. L2 Oscillator coil
Figure 16. L1 Antenna Coil
Coil support: Toko 10K Primary winding: 10 Turns of enamelled copper wire 0.16 mm diameter (pins 3-1). Secondary winding: 4 Turns copper wire 0.16 mm diameter (pins 6-4)
Coil support: Toko 10K Primary winding: as L2 (pins 3-1) Secondary winding: 2 Turns copper wire 0.16 mm diameter (pins 6-4)
Figure 17. Low cost 27 MHz receiver with external xtal oscillator
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APPLICATION INFORMATION (continued)
Figure 18. 455 KHz FM narrow band IF
Figure 18. P.C. board and component layout of the circuit of fig. 18
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APPLICATION INFORMATION (continued)
Figure 20. Discriminator "S" curve response (circuit of fig. 18)
Figure 21. Application in sound channel of multistandard TV or in parallel AM modulated sound channel (AM section only).
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ELECTRICAL CHARACTERISTICS (Vs = 12V) AM Section (fo = 39MHz; fm = 15KHz)
Parameter Audio out (m = 0.3) S/N (Vi = 100 mV; S/N (Vi = 1mV; S/N (Vi = 10mV; m = 0.3) m = 0.3) m = 0.3) Typ 60 37 55 56 65 150 600 m = 0.3) m = 0.3) m = 0.3) m = 0.8) m = 0.8) m = 0.8) 2 1 0.8 7 5 3 Unit mV dB dB dB dB mV KHz % % % % % %
AGC range (m = 0.8, Vout = 3dB) Max input signal handling (m = 0.8; d = 5%) - 3dB bandwidth Distortion (Vi = 100 V; (Vi = 1mV; (Vi = 10mV; (Vi = 100 V; (Vi = 1mV; (Vi = 10mV;
FM Section (fo = 5.5MHz; fm = 1KHz)
Parameter -3dB input limiting voltage AMR (f = +25KHz; (f = +25KHz; (f = +25KHz; S/N S/N S/N Distortion (f = 25KHz; (f = 25KHz; (f = 25KHz; (f = 25KHz; (f = 25KHz; (f = 25KHz; (f = 50KHz; (f = 50KHz (f = 50KHz; (f = 25KHz) m = 0.3; m = 0.3; m = 0.3; Vi = 100 V) Vi = 1 mV) Vi = 10mV) Vi = 100 V) Vi = 1 mV) Vi = 10 mV) Vi = 100 V) Vi = 1mV) Vi = 10mV) Vi = 100 V) Vi = 1mV) Vi = 10mV) Typ 3 40 58 54 51 70 70 0.5 0.6 0.6 1 1 1 70 Unit V dB dB dB dB dB dB % % % % % % mV
Recovered audio (f = 15KHz; Vi = 1 mV) Recovered audio can be varied by variation of 3.3K ohm resistor in parallel with the discriminator coil) Max input signal handling
Note: AM performance at 39MHz can be improved by mean of a selective preamplifier stage.
1
V
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DIP16 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 mm TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX.
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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. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
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