參數(shù)資料
型號(hào): LA1784
廠商: Sanyo Electric Co.,Ltd.
英文描述: Single-Chip Tuner IC for Car Radios
中文描述: 單芯片調(diào)諧器IC的汽車收音機(jī)
文件頁數(shù): 36/50頁
文件大?。?/td> 568K
代理商: LA1784
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. 6039-36/50
LA1784M
55
24
23
26
AM IF
+
S-meter
100 k
0.47
μ
F
51 k
Seek
5 V
5 V
IF buffer
IF buff amp.
SD
0.022
μ
F
100 k
50 pF
Comparator
50
μ
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
0
10
20
30
40
50
60
70
80
0
10
20
30
40
50
A
μ
Resistance between pin 55 and ground — k
AM SD Sensitivity Adjustment
Fig.38
Fig. 36
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