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CXA1538 View Datasheet(PDF) - Sony Semiconductor

Part Name
Description
View to exact match
CXA1538
Sony
Sony Semiconductor Sony
CXA1538 Datasheet PDF : 15 Pages
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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.
27
28
10k
Capacitor for decoupling
22k
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.
33k
VCC
4
Q1
Q2
about 180mVp-p
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.
2.2k
VCC=3V
4
When VCC is 3 V or more, insert a bypass resistance
R to prevent LED malfunction.
2.2k
VCC>3V
4
Without the use of a stereo indicator.
R
4
OPEN
4
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
—10—
 

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