LA1781M(2001) Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
componentes Descripción
Fabricante
LA1781M Datasheet PDF : 50 Pages
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Continued from preceding page.
Pin No.
Function
47
FM muting on level
adjustment
48
RF AGC bypass
57
RF AGC
50
IF bypass
51
FM IF input
52
IF input
LA1781M
Description
Modify the value of the external
resistor to adjust the muting on
level.
VCC
Equivalent circuit
30 kΩ
R
47
140 µA
Pin 24
VCC
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
+
3.3 µF
For AGC use
57
+
47 µF
5.6 V
Inverter
MUTE
A11742
10 kΩ
Antenna
damping
A11743
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.
2.6 V
10 kΩ
50
0.022 µF
330 Ω
51
IF in
2 kΩ
The input impedance is 2 kΩ.
52
10 kΩ
A11744
100 Ω
A11745
Continued on next page.
No. 6038-16/50
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