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LA1787M
Continued from preceding page.
Pin No.
Function
Description
0.1 μ F
VREF
Equivalent circuit
R1
VCC
C
37
R2
36
35
34
?The resistor R 1 determines the
width of the band muting function.
Increasing the value of R 1
narrows the band.
Reducing the value of R 1 widens
the band.
VCC
Quadrature
detector
34
AGC
35
36
QD output
QD input
?Null voltage
When tuned, the voltage between
37
V REF
pins 34 and 37, V 34 – 37 , will be 0 V.
The band muting function turns
HOLE
DET
3pF
on when |V 34 – 37 | ≥ 0.7 V.
V 37 = 4.9 V
IF limitter amplifier
1k ?
Band
muting
A13577
A 130-μA current flows from pin
38
R
SD ADJ
38
FM SD ADJ
38 and, in conjunction with the
external resistance R, determines
130 μ A
the comparison voltage.
+
–
SD
Comparator
24
S-meter
A13578
The keyed AGC operates when
S-meter
6.4k ?
3.6k ?
24
the voltage created by dividing the
pin 24 S-meter output voltage by
Comparator
39
Keyed AGC
AM stereo buffer
the 6.4 and 3.6 k ? resistors
becomes lower than the voltage
determined by the resistor
between pin 39 and ground.
KEYED
AGC
+
–
1.3V
VCC
90 μ A
39
This pin also is used as the AM
stereo IF buffer pin.
AM IF out
50pF
150 ?
A13579
Continued on next page.
No. 6655-13/54
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