參數(shù)資料
型號: LA1787M
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: 14 X 14 MM, QFP-64
文件頁數(shù): 25/54頁
文件大小: 606K
代理商: 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.
No. 6655-31/54
LA1787M
S-meter
FM IF
HOLE
CLET
Muting
drive
output
STEREO
IND
Band
muting
39
24
33
23
26
+
+
+
4.9V
R
IF count buffer
IF count output
2.5V 5V
SD
STEREO/MONO
5V
A11759
V23DC
V23AC
V26
V33
V38
V24
5 V
Larger
values
of R33
Smaller values of R33
S-meter
V33
over 0.7 V
V33
over 0.7 V
On as an
SD signal
SD
ON
SD
ON
Stereo
Mono
0.7 V
OFF
IF count
buffer
5 V
2.5 V
0 V
IF counter output off
RDS and other types of SD detection can be used by switching these modes.
A11758
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.
New LA1784M functionality:
Fig. 13
Fig. 14
Figure 14 shows the relationship between the FM SD, the IF count buffer output, the S-meter, and the muting drive
output.
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