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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA1220B датащи(PDF) 8 Page - STMicroelectronics |
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TDA1220B датащи(HTML) 8 Page - STMicroelectronics |
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8 / 18 page  8/18 APPLICATION SUGGESTION Reccomended values are referred to the test circuit of Fig. 2. 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 (*) 100 nF AM input DC cut C3 (*) 10 nF FM input DC cut C4 C5 20 nF 20 nF FM amplifier bypass Reduction of sensitivity – Bandwidth increase – 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 µF AGC bypass Increase of the distortion at low audio frequency Increase of the AGC time constant C10 (*) 56 pF Tuning of the AM oscillator at 1455 KHz C11 6.8 nF 50 µs FM de-enphasis C12 100 nF Output DC decoupling Low audio frequency cut C13 220 µF Power supply decoupling Increase of the distortion at low frequency C16 2.7 nF AM detector capacitor Low suppression of the IF frequency and harmonics Increase of the audio distortion 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 coil Q setting Audio output decrease and higher AMR Audio output increase and higher distortion R5 560 ohm FM detector load resistor Lower IF gain and Lower AGC range R6 82 Kohm AM detector coil Q setting Higher IF gain and lower AGC range R7 2.2 Kohm 455 KHz IF filter matching R8 3.3 Kohm 455 KHz IF filter matching (*) Only for test circuit TDA1220B |
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