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LA1787M
Continued from preceding page.
Pin No.
Function
Description
Equivalent circuit
VCC
FM
detector
output
31
30
Noise canceller input
Pin 30 is the noise canceller input.
The input impedance is 50 k ? .
Pin 31 is the AM and FM detector
VCC
10k ?
31
AM/FM detector output
output
In FM mode, this is a low-
impedance output.
In AM mode, the output
impedance is 10 k ? .
To improve the low band
separation, use a coupling
capacitor of over 10 μF.
AM
detector
Noise
canceller
30
1 μ F
+
50k ?
4.2V
A13574
VCC
32
32
IF S-meter output and MRC
DC input
FM S-meter output block
MRC AC input block
Adjust the external 1-k ? resistor
to attenuate the MRC AC input
10k ?
+
1 μ F
and control the circuit.
MRC input
C1
1k ?
A13575
?The muting time constant is
determined by an external RC
+
0.1 μ F
circuit as described below.
Attack time: T A = 10 k ? × C1
Release time: T R = 50 k ? × C1
VCC
33
50k ?
MUTE
?Noise convergence adjustment
AMP.
33
Mute drive output
The noise convergence can be
adjusted when there is no input
SEEK
OFF
10k ?
signal by inserting a resistor
between pin 33 and ground.
?Muting off function
SOFT
MUTE
HOLE
DET
Band
muting
50k ?
Ground pin 33 through a 4-k ?
resistor.
SD circuit
A13576
Continued on next page.
No. 6655-12/54
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