参数资料
型号: LA1787M
元件分类: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封装: 14 X 14 MM, QFP-64
文件页数: 8/54页
文件大小: 606K
代理商: LA1787M
No. 6655-16/54
LA1787M
Pin No.
Function
Description
Equivalent circuit
52
IF input
The input impedance is 2 k
.
47
+
VCC
30k
R
140
A
Pin 24
MUTE
Inverter
A13586
+
48
+
57
+
VCC
5.6V
10k
Antenna
damping
3.3
F
47
F
For AGC use
A13587
50
51
2.6V
10k
10k
0.022
F
330
IF in
A13588
52
2k
100
A13589
Continued from preceding page.
Continued on next page.
FM muting on level
Modify the value of the external
47
adjustment
resistor to adjust the muting on
level.
RF AGC rectification capacitor
The low frequency distortion is
determined as follows:
Increasing C48 and C57 improves
48
RF AGC bypass
the distortion but makes the
57
RF AGC
response slower.
Reducing C48 and C57
aggravates the distortion but
makes the response faster.
50
IF bypass
51
FM IF input
Due to the high gain of the limiter
amplifer, care must be taken when
choosing the grounding point for
the limiter amplifer input capacitor
to prevent oscillation.
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