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CXA1538N Datasheet(PDF) 10 Page - Sony Corporation |
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CXA1538N Datasheet(HTML) 10 Page - Sony Corporation |
10 / 15 page —10— CXA1538M/N/S Notes on Usage 1. VCO free run frequency adjustment method As this IC has built-in oscillation capacitance, the oscillation frequency can be controlled with an external resistor. 1) VCO Adjustment Method Pin 4 is the stereo indicator and VCO check pin. Therefore, in stereo mode (when stereo indicator drive Tr Q2 is switched on), pin 4 voltage lowers down, Q1 is cut off and VCO oscillation waveform can not be seen. In AM mode as well, the oscillation waveform can not be seen as VCO turns off. Adjust the free run frequency at 76 kHz ±50 Hz. In this IC, tuner and MPX sections are directly connected. Therefore, free run frequency is not stable, being affected by noise except in reception mode. For free run adjustment, input signals from either RF or IF. (Input signal should be RF [Tuning frequency] or fo of the discriminator using IF (10.7 MHz) and input more than 60 dBµ.) 2) How to Deal with pin 4 After Adjustment. With the use of a stereo indicator. When VCC is 3 V or more, insert a bypass resistance R to prevent LED malfunction. Without the use of a stereo indicator. Turn pin 4 to open or connect to GND. 3) Control Resistor of VCO Oscillation Frequency For the VCO control resistor of this iC, a carbon film resistor suffices. For easier adjustment of temperature characteristics and VCO free run frequency, the following combination is recommended. 27 28 10k 22k Capacitor for decoupling Q1 Q2 33k VCC about 180mVp-p 4 2.2k VCC=3V 4 OPEN 4 4 27 28 10k 22k 2.2k R VCC >3V 4 |
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Similar Description - CXA1538N |
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