TDA7220 VERY LOW VOLTAGE AM-FM RADIO .. .. .. . OPERATING SUPPLY VOLTAGE : 1.5 TO 6V HIGH SENSITIVITY AND LOW NOISE LOW BATTERY DRAIN VERY LOW TWEET HIGH SIGNAL HANDLING VERY SIMPLE DC SWITCHING OF AM-FM AM SECTION OPERATES UP TO 30MHz DIP16 DESCRIPTION The TDA 7220 is a monolithic integrated circuit in a 16-lead dual in-line plastic package designed for use in 3V, 4.5V and 6V portable AM-FM radio receivers. The functions incorporated are : AM Section - Preamplifier and do uble balance d mixer with AGC - On pin local oscillator - IF amplifier with internal AGC - Detector and audio preamplifier FM SECTION - IF amplifier and limiter - Quadrature detector - Audio preamplifier ORDERING NUMBER : TDA7220 SO16 ORDERING NUMBER : TDA7220D PIN CONNECTION June1993 1/16 TDA7220 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol VS Ptot Toper Tstg, Tj Parameter Supply Voltage o Total Power Dissipation at Tamb < 110 C (DIP16) Operating Temperature Storage and Junction Temperature Value 6.5 400 - 20 to + 85 - 55 to +150 Unit V mW o C oC THERMAL DATA Symbol R th (j-a) 2/16 Parameter Junction-ambient Thermal Resistance Max. DIP16 100 SO16 200 Unit C/W o TDA7220 ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 3V, unless specified, refer to Test Circuit) Symbol ID Parameter Drain Current Test Conditions Min. Typ. Max. Unit AM Section FM Section 11 10 18 15 mA mA S/N = 26dB, m = 0.3 12 25 µV AM SECTION (fO = 1MHz, fm = 1kHz) VI Input Sensitivity S/N Signal to Noise VI = 1mV, m = 0.3 40 ∆VI AGC Range ∆VOUT = 10dB, m = 0.8 90 VO Recovered Audio Signal (Pin 9) VI = 1mV, m = 0.3 40 0.5 d Distortion VH Max. Input Signal Handling Capability m = 0.8, d < 10% RI Input Resistance between Pins 2 and 4 m=0 CI Input Capacitance between Pins 2 and 4 m=0 RO Output Resistance (Pin 9) 50 dB dB 80 110 mV 0.6 % 7.5 kΩ V 18 pF 4.5 kΩ Tweet 2 IF VI = 1mV, m = 0.3 40 dB Tweet 3 IF VI = 1mV, m = 0.3 55 dB FM SECTION (fO = 10.7MHz, fm = 1kHz) VI - 3dB limiting point 33 Amplitude Modulation Rejection ∆f = ± 22.5kHz, VI = 3mV, m=3 40 dB S/N Signal to Noise ∆f = ± 22.5kHz, VI = 1mV 65 dB Distortion ∆f = ± 22.5kHz, VI = 1mV ∆f = ± 75kHz d ∆f = ± 22.5kHz, VI = 1mV 50 40 80 µV Input Limiting Voltage AMR 0.3 1.1 1.5 % % 70 90 mV VO Recovered Audio SIgnal (Pin 9) RI Input Resistance between Pin 16 and Ground 6.5 CI Input Capacitance between Pin 16 and Ground 14 pF RO Output Resistance (Pin 9) 4.5 kΩ kΩ 3/16 TDA7220 ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 1.6V, unless specified, refer to Test Circuit) Symbol ID Parameter Drain Current Test Conditions Min. Typ. Max. Unit AM Section FM Section 8 7 15 13 mA mA 15 25 µV AM SECTION (fO = 1MHz, fm = 1kHz) VI Input Sensitivity S/N = 26dB, m = 0.3 S/N Signal to Noise VI = 1mV, m = 0.3 40 ∆VI AGC Range ∆VOUT = 10dB, m = 0.8 90 VO Recovered Audio Signal (Pin 9) VI = 1mV, m = 0.3 40 0.5 d Distortion VH Max. Input Signal Handling Capability m = 0.8, d < 10% RI Input Resistance between Pins 2 and 4 m=0 CI Input Capacitance between Pins 2 and 4 m=0 RO Output Resistance (Pin 9) Tweet 2 IF VI = 1mV, m = 0.3 Tweet 3 IF 48 dB 75 mV 0.5 % 7.5 kΩ dB V 18 pF 4.5 kΩ 40 dB 55 dB FM SECTION (fO = 10.7MHz, fm = 1kHz) Input Limiting Voltage - 3dB limiting point 50 µV AMR Amplitude Modulation Rejection ∆f = ± 22.5kHz, VI = 3mV, m=3 34 dB S/N Signal to Noise ∆f = ± 22.5kHz, VI = 1mV 55 dB VI Distortion ∆f = ± 22.5kHz, VI = 1mV 0.6 % VO Recovered Audio SIgnal (Pin 9) ∆f = ± 22.5kHz, VI = 1mV 55 mV RI Input Resistance between Pin 16 and Ground 6.5 kΩ CI Input Capacitance between Pin 16 and Ground 14 pF RO Output Resistance (Pin 9) 4.5 kΩ d 4/16 TDA7220 Figure 1 : Test Circuit Figure 2 : P.C. Board and Component Layout (1:1 scale) of the Test Circuit 5/16 TDA7220 AM-FM SWITCHING AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference. TYPICAL DC VOLTAGE (refer to the test circuit) Pins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Unit AM 3 1.1 3 1.1 1.1 2.5 3 0.7 1.2 3 0 2.1 2.1 2.9 3 2.9 V FM 3 0 3 0 0 2.4 3 0 0.9 3 0 3 3 2.7 2.7 2.7 V APPLICATION SUGGESTION Recommended values referred to the test circuit of Figure 1 Part Number Recommended Value C1 100µF AGC Bypass C2 (1) 100nF AM Input DC Cut C3 (1) 10nF FM Input DC Cut C4 C5 20nF 20nF FM Amplifier Bypass C7 100nF FM detector Decoupling Danger of RF Irradiation C8 100nF Power Supply Bypass Noise increase of the audio output C9 10µF AGC Bypass Increase of the distortion at low audio frequency C10 (1) 56pF Tuning of the AM Oscillator at 1455kHz C11 10nF 50ms FM De-emphasis C12 100nF Output DC Decoupling Low audio frequency cut C13 220µF Power Supply Decoupling Increase of the distortion at low frequency C16 2.7nF AM Detector capacitor Low suppression of the IF frequency and harmonics Increase of the audion distortion R1 (1) 68Ω FM Input Matching R2 (1) 56Ω AM Input Matching R3 330Ω Ceramic Filter Matching R4 6.8kΩ FM Detector Coil Q Setting Audio output decrease and lower distortion Audio output increase and higher distortion R5 560Ω FM Detector Load Resistor Audio output decrease and higher AMR R6 13kΩ AM Detector Coil Q Setting Lower IF Gain and Lower AGC Range (1) Only for test circuit. 6/16 Purpose Smaller than Recommended Value Larger than Recommended Value Increase of the distortion at low audio frequency Increase of the AGC time constant Reduction of sensitivity - bandwidth increase - higher noise Increase of the AGC time constant Higher IF Gain and Lower AGC Range TDA7220 Figure 3 : Audio Output and Noise versus Input Signal (AM section) VS = 3V Figure 4 : Audio Output and Noise versus Input Signal (AM section) VS = 1.6V Figure 5 : Distortion versus Input Signal (AM section) VS = 3V Figure 6 : Distortion versus Input Signal (AM section) VS = 1.6V Figure 7 : Audio Output versus Supply Voltage (AM section) Figure 8 : Amplified AGC Voltage (Pin 4) versus Input Signal (AM section) 7/16 TDA7220 Figure 9 : Audio Output and Noise versus Input Signal (FM section) VS = 3V Figure 10 : Audio Output and Noise versus Input Signal (FM section) VS = 1.6V Figure 11 : Distortion versus Input Signal (FM section) VS = 3V Figure 12 : Distortion versus Input Signal (FM section) VS = 1.6V Figure 13 : Audio Output versus Supply Voltage (FM section) Figure 14 : Amplified AGC Voltage (Pin 4) versus Input Signal (FM section) 8/16 TDA7220 Figure 15 : DC Output Voltage (Pin 9) versus Supply Voltage (FM section) Figure 16 : AFC Output Voltage (Pin 9) versus Frequency Deviation (FM section) Figure 17 : Drain Current versus Supply Voltage APPLICATION INFORMATION TYPICAL PERFORMANCE OF THE RADIO RECEIVER OF FIGURE 18 (VS = 3V, RL = 32Ω) Parameter Wavebands Sensitivity Distortion (fm = 1kHz) Signal to Noise (fm = 1kHz) Amplitude Modulation Rejection Quiescent Current Supply Voltage Range Test Conditions FM AM FM AM AM FM AM FM AM FM S/N = 26dB, ∆f = 22.5kHz S/N = 6dB, m = 0.3 S/N = 26dB, m = 0.3 ∆f = 22.5kHz PO = 20mW ∆f = 75kHz VI = 100µV m = 0.3 ∆f = 22.5kHz PO = 20mW VI = 100µV m = 0.3 VI = 100µV, ∆f = 22.5kHz, m = 0.3 Value 87.5 to 108 510 to 1620 3 2 10 0.5 1.8 1.1 60 45 40 16 1.6 to 3 Unit MHz kHz µV µV µV % % % dB dB dB mA V 9/16 TDA7220 APPLICATION INFORMATION Figure 18 : Stereo AM/FM Miniradio 10/16 TDA7220 Figure 19 : 0.3W AM/FM Monoradio 11/16 TDA7220 TYPICAL APPLICATION 12/16 TDA7220 13/16 TDA7220 SO16 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. TYP. 1.75 0.1 MAX. 0.069 0.25 a2 0.004 0.009 1.6 0.063 b 0.35 0.46 0.014 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.020 c1 45 (typ.) D 9.8 10 0.386 0.394 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.150 0.157 L 0.4 1.27 0.016 0.050 M S 14/16 MIN. 0.62 0.024 8 (max.) TDA7220 DIP16 PACKAGE MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 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 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 15/16 TDA7220 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 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. 16/16