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參數(shù)資料
| 型號(hào)： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數(shù)： | 21/50頁 |
| 文件大?。?/td> | 568K |
| 代理商： | LA1784M |
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5. 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. 6039-28/50
LA1784M
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
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.
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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