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LA1787M
Continued from preceding page.
Pin No.
Function
Description
Equivalent circuit
4.9V
50k ?
+
–
AM MUTE
This pin functions both as the IF
counter buffer (AC output) and as
the seek/stop switch pin.
The voltage V23 switches
SW
+
–
+
–
10k ?
150 ?
1.3V
VCC
IF counter
buffer
between the following three
modes.
50F
23
IF counter buffer seek/stop
switching
During FM reception:
5 V: Seek mode
2.5 V: Forced SD mode
0 V: Reception mode
AM reception
SD
23
51k ?
(two modes: 0 and 5 V)
5 V:
0 V:
Seek mode
Reception mode
IF
BUFF.
STOP
Forced
SEEK
SD: 2.5V 5V
A13568
VCC
FM
S-meter
24
AM/FM signal meter
Fixed-current drive signal meter
output
AM
10k ?
32
32
Dedicated FM signal meter
In AM mode, pin 32 outputs a
1-mA current. Thus the HCC
circuit is turned off.
S-meter
AM/FM
10k ?
24
SW
Outputs a 1-mA
current during AM
reception
MRC
AM/FM
SW
A13569
The voltage V23 switches
between three modes as follows.
FM reception:
5 V:
The SD pin operates linked
to the IF counter buffer.
AM/FM
SD
Stereo
indicator
26
Stereo indicator for the SD pin
2.5 V: Forced SD mode: operates
as the SD pin.
0.7 V: Reception mode: stereo
indicator
26
Seek/stop
switching
AM reception: (two modes: 0 and 5 V)
5 V:
0 V:
Operates as the seek SD pin.
Reception mode. Not used.
100k ?
VDD
A13570
Continued on next page.
No. 6655-10/54
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