參數(shù)資料
型號: LA1787M
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): 33/54頁
文件大?。?/td> 606K
代理商: LA1787M
Notes on AM SD (pin 26) and the SD adjustment pin
SD and the IF buffer are operated by comparing the S-meter level (V24) and the 5 V reference voltage as shown in
figure 36.
Figure 37 shows the relationship between the AM SD, the IF count buffer, and the S-meter.
No. 6655-39/54
LA1787M
55
24
23
26
AM IF
+
S-meter
100 k
0.47
F
51 k
Seek
5 V
IF buffer
IF buff amp.
SD
0.022
F
100 k
50 pF
Comparator
50
A
VCC
A12085
V23DC
V23AC
V26
V55
V24PIN
Larger
values
of R55
Smaller values of R55
5 V
Pin 55: AM SD adjustment pin
OFF
IF buffer on
SD on
S-meter
0 V
A11760
Fig. 36
Fig. 37
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