CXA1538M/N/S
Pin Voltage (V)
No.
Symbol
VCC=3 V VCC=6 V
FM AM FM AM
Equivalent circuit
Description
21 REG
23 AFC
1.25 1.25 1.25 1.25
23
Regulator output
21
1.25V
REG
Variable capacitance for AFC
22 FM OSC
22
1.25 1.25 1.25 1.25
REG
FM local oscillation circuit
24 AM OSC
24
1.25 1.25 1.25 1.25
REG
AM local oscillation circuit
26 FM DISCRI 2.30 2.70 3.60 4.00
26
1k
Phase shift circuit to connect
to ceramic discriminator
27 VCO
28 MPX REG 1.65 1.65 1.65 1.65
30 GND
0000
27
28 MPX REG
VCO control pin for stereo
demodulation
Regulator for MPX
30
GND of MPX block
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