LA1781M_09 Datasheet, PDF (6/48 Pages) Sanyo Semicon Device – For Car Radios Single-Chip Tuner IC

Pin Descriptions
Pin No.
1
Pin function
Antenna damping drive
LA1781M
Pin description
An antenna damping current flows
when the RF AGC voltage (pin 2)
ANT
reaches VCC - VD.
Equivalent circuit
VCC
Pin 62
RF
AGC
1000pF
100Ω
1
1000pF
300Ω
100Ω
2
RF AGC
3
F.E.GND
4
OSC
7
AM OSC
Used to control the FET
VCC
second gate.
FET
12kΩ
2ND GATE
2
+
N
AGC
DET
KEYED
AGC
ANT
DAMPING
DRIVER
W
AGC
DET
VCC
Oscillator connection.
The transistor and capacitors
required for the oscillator circuit are
integrated on the chip.
VT
AM first oscillator.
This circuit can oscillator up to the
SW band.
An ALC circuit is included.
VCC
4
25pF
2kΩ
20pF
7
VCC
ALC
Continued on next page.
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