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LA1787M
Continued from preceding page.
Pin No.
Function
Description
Equivalent circuit
+
0.022 μ F
240k ?
VCC
C
2.2 μ F
G1; Used for time constant
42
44
VCC
switching during seeks.
? Reception
τ = 2.2 μF × 300 k ?
DET
50k ?
44
IF AGC
? Seek
τ = 2.2 μF × 10 ?
The external capacitors are
connected to V CC .
This is because the IF amplifier
operates referenced to V CC .
G1
50k ?
IF
AGC
SEEK
ON
10 ?
A13583
Pin 40 VCC
45
Pin 40 VCC
45
IF output
The IF amplifier load
46
50pF
100 ?
VCC
DET
A13584
46
AM antenna damping
drive output
Wide band AGC input
I 46 = 6 mA (maximum)
This is the antenna damping
current.
VCC
20k ?
W.AGC AMP.
ANT DAMPING
DRIVER
A13585
Continued on next page.
No. 6655-15/54
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