Daewoo DTD-25G1 ME, Service Manual

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APPENDIX
PIN NAME FUNCTION INTERFACE
1 IF VCC A Vcc terminal for the IF circuit.
Supply 5V.
2 RIPPLE A terminal should be connected to an internal
FILTER bias filler. Put a capacilor.
3 SIF OUT An output terminal for a 2’nd SIF signal, that
is mixed down by a regenerated carrier.
The SIF frequencies are able to convert into
only 6.5MHz, in order to eliminate SIF BPFs
to single 6.5MHz.
4 AUDIO OUT An output terminal for audio signal.
FM Det.signal, inputted to pin53, is output.
An internal audio attenator controls the output
levels.
5 IF GND The GND terminal for IF circuit.
6 IF IN Input terminals for IF signals. Pin 6 and 7 are
7 IF IN the both input poles of a differential amplifier.
The normal input level is 90dB( V )( Pin6-7),
input impedance is 1.5 k ohms.
TERMINAL INTERFACE
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IC DESCRIPTION