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LA1787M
Continued from preceding page.
Pin No.
Function
Description
1ST.IF
Equivalent circuit
OSC
59
Double balanced mixer
Pins 59 and 60 are the mixer
59
60
Mixer output
10.7-MHz output
Pins 63 and 64 are the mixer
input.
30 ?
60
VCC
This is an emitter insertion type
63
64
Mixer input
circuit, and the amount of
insertion is determined by the
capacitors C1 and C2.
Note:The lines for pins 63 and 64
must be kept separated from
the lines for pins 59 and 60.
VCC
RF AMP
C1
5pF
C2
63
64
5pF
620 ?
620 ?
A13593
Pin 6 functions both as the FM
front end V CC and the AM/FM
switching circuit.
SD
+
6
VCC
510 ?
+
–
AM/FM
switching circuit
6
Front end V CC AM/FM
switching
V6 voltage Mode
When 8 V → FM
8V
FM.F.E
AGC
100k ?
3.3V
OPEN → AM
to RF
Amp.
62
3
GND
AM 1st
MIX
A13594
62
1st MIX
INPUT
First mixer input
The input impedance is about
10 k ? .
10k ?
2.1V
A13595
10k ?
5.6V
20pF
to 2nd
MIX
Crystal oscillator circuit
10
AM 2nd OSC
The Kinseki, Ltd. HC-49/U-S and
33pF
a C L of 20 pF must be used.
10
X tal
A13596
No. 6655-18/54
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