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TDA7220 Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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TDA7220 Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 16 page 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 Purpose Smaller than Recommended Value Larger than Recommended Value C1 100 µF AGC Bypass Increase of the distortion at low audio frequency Increase of the AGC time constant C2 (1) 100nF AM Input DC Cut C3 (1) 10nF FM Input DC Cut C4 C5 20nF 20nF FM Amplifier Bypass Reduction of sensitivity - bandwidth increase - higher noise C7 100nF FM detector Decoupling Danger of RF Irradiation C8 100nF Power Supply Bypass Noise increase of the audio output C9 10 µF AGC Bypass Increase of the distortion at low audio frequency Increase of the AGC time constant 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 220 µF 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) 68 Ω FM Input Matching R2 (1) 56 Ω AM Input Matching R3 330 Ω Ceramic Filter Matching R4 6.8k Ω FM Detector Coil Q Setting Audio output decrease and lower distortion Audio output increase and higher distortion R5 560 Ω FM Detector Load Resistor Audio output decrease and higher AMR R6 13k Ω AM Detector Coil Q Setting Lower IF Gain and Lower AGC Range Higher IF Gain and Lower AGC Range (1) Only for test circuit. TDA7220 6/16 |
Codice articolo simile - TDA7220 |
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Descrizione simile - TDA7220 |
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