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LA1787M
2. FM IF
? Notes on the FM SD and SD adjustment
The figure below presents an overview of the FM SD and the IF count buffer.
4.9V
R
+
–
R
+
–
Band
muting
Muting
R
HOLE
CLET
drive
output
STEREO
IND
S-meter
+
–
IF count buffer
FM IF
39
24
33
23
26
5V
IF count output
SD
STEREO/MONO
2.5V 5V
Fig. 13
A11759
Figure 14 shows the relationship between the FM SD, the IF count buffer output, the S-meter, and the muting drive
output.
V24
V38
Larger
values
of R33
S-meter
V33
Smaller values of R33
V26
5V
V33
over 0.7 V
V33
over 0.7 V
On as an
SD signal
SD
ON
SD
ON
Stereo
Mono
V23AC
0.7 V
OFF
IF count
buffer
OFF
IF counter output off
V23DC
5V
2.5 V
0V
RDS and other types of SD detection can be used by switching these modes.
New LA1784M functionality: For stereo input (when the V26 pin voltage is 0.7 V),
when this pin is shorted to ground (0.1 V or lower)
the IC will operate in forced mono mode.
A11758
Fig. 14
No. 6655-31/54
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