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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LA7583 датащи(PDF) 7 Page - Sanyo Semicon Device |
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LA7583 датащи(HTML) 7 Page - Sanyo Semicon Device |
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7 / 15 page  Pin Functions Pin No. Symbol Circuit Configuration Description 1 FM DETECTOR OUTPUT Pin 1 is an audio FM output pin. A 100 Ω resistor is connected in series with the emitter follower. (1) Monaural applications CR are used to form a de-emphasis cicuit externally. t = CR1 (2) Audio multiplexing applications Depending on the audio multiplexing decoder application, the input impedance is low, which may distort the L-R signals, etc., and degrade the stereo characteristics. In such an event, add a resistor between pin 1 and GND. R2 ^ 5.1 k Ω 2 FM AQT FILTER GYLATOR Pin 2 is the FM Automatic Quadrature Tuning filter pin. This pin controls the quadrature detector so that it remains at its center frequency (4.5 MHz), and is the point where the two control currents are added. If the value of external capacitor C1 is small, the low-range frequency characteristics deteriorate. If the capacitance is too large, the low-range characteristics improve, but the response characteristics at SW-ON, etc., worsen. The recommended value for C1 is 10 µF to 33 µF. 3 RF AGC OUTPUT Pin 3 is the RF AGC output pin. It is an emitter output, and a protective resistor of 200 Ω is connected between pin 3 and emitter. This pin determines the resistance bleeder (R1, R2) values according to the maximum gain of the tuner. Continued on next page. LA7583 No.5177-7/15 |
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