參數(shù)資料
型號(hào): LA1781M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: 14 X 14 MM, QIP-64
文件頁數(shù): 29/48頁
文件大?。?/td> 508K
代理商: LA1781M
LA1781M
No.6038-35/48
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 5V reference voltage as shown in
figure 36.
Fig.36
Figure 37 shows the relationship between the AM SD, the IF count buffer, and the S-meter.
Fig.37
55
24
23
26
AM IF
+
--
S-meter
100k
Ω
0.47
μF
51k
Ω
Seek
5V
IF buffer
IF buff amp.
SD
0.022
μF
100k
Ω
50pF
Comparator
50
μA
VCC
V23DC
V23AC
V26
V55
V24PIN
Larger
values
of R55
Smaller values of R55
5V
Pin 55 AM SD adjustment pin
OFF
IF buffer on
SD on
S-meter
0V
AM SD Sensitivity Adjustment
0
20
30
40
50
60
70
10
80
010
20
40
30
50
Resistance between pin 55 and ground -- k
Ω
Antenna
input
such
that
pin
26
becomes
5V
-
dB
μ
Fig. 38
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