参数资料
型号: LA1781M
元件分类: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封装: 14 X 14 MM, QIP-64
文件页数: 7/48页
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-15/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
48
57
RF AGC bypass
RF AGC
RF AGC rectification capacitor
The low frequency distortion is
determined as follows :
Increasing C48 and C57 improves the
distortion but makes the response
slower.
Reducing C48 and C57
aggravates the distortion but makes
the response faster.
+
48
+
57
+
--
Antenna
damping
VCC
5.6V
10k
Ω
3.3
μF
47
μF
For AGC use
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.
50
51
2.6V
10k
Ω
10k
Ω
0.022
μF
330
Ω
IF in
52
IF input
The input impedance is 2k
Ω.
52
2k
Ω
100
Ω
53
56
IF amplifier output
IF amplifier input
Input and output pin or the first IF
amplifier
Inverting amplifier
V56 = 2V
Input impedance : RIN = 330Ω
V53 = 5.3V
Output impedance
ROUT = 330Ω
53
56
IF OUT
IF IN
2.75V
300
Ω
VCC
300
Ω
Continued on next page.
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