參數(shù)資料
型號(hào): LA1781M
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): 16/50頁
文件大?。?/td> 567K
代理商: LA1781M
No. 6038-16/50
LA1781M
Pin No.
Function
Description
Equivalent circuit
52
IF input
The input impedance is 2 k
.
47
+
Inverter
VCC
30 k
R
140
μ
A
Pin 24
MUTE
A11742
+
48
+
57
+
Antenna
damping
VCC
5.6 V
10 k
3.3
μ
F
47
μ
F
For AGC use
A11743
50
51
2.6 V
10 k
10 k
0.022
μ
F
330
IF in
A11744
52
2 k
100
A11745
Continued from preceding page.
Continued on next page.
FM muting on level
adjustment
Modify the value of the external
resistor to adjust the muting on
level.
47
RF AGC rectification capacitor
The low frequency distortion is
determined as follows:
Increasing C48 and C57 improves
the distortion but makes the
response slower.
48
57
RF AGC bypass
RF AGC
Reducing C48 and C57
aggravates the distortion but
makes the response faster.
50
51
IF bypass
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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