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參數(shù)資料
| 型號(hào)： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數(shù)： | 8/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-16/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
52
IF input
The input impedance is 2 k
.
47
+
–
Inverter
VCC
30 k
R
140
A
Pin 24
MUTE
A11742
+
48
+
57
+
–
Antenna
damping
VCC
5.6 V
10 k
3.3
F
47
F
For AGC use
A11743
50
51
2.6 V
10 k
10 k
0.022
F
330
IF in
A11744
52
2 k
100
A11745
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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