參數(shù)資料
型號(hào): LA1781M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: 14 X 14 MM, QIP-64
文件頁數(shù): 45/48頁
文件大?。?/td> 508K
代理商: LA1781M
LA1781M
No.6038-6/48
Pin Descriptions
Pin No.
Pin function
Pin description
Equivalent circuit
1
Antenna damping drive
An antenna damping current flows
when the RF AGC voltage (pin 2)
reaches VCC - VD.
1
ANT
1000pF
100
Ω
100
Ω
300
Ω
VCC
Pin 62
RF
AGC
2
RF AGC
Used to control the FET
second gate.
+
2
N
AGC
DET
W
AGC
DET
KEYED
AGC
ANT
DAMPING
DRIVER
VCC
12k
Ω
FET
2ND GATE
3
F.E.GND
4
OSC
Oscillator connection.
The transistor and capacitors
required for the oscillator circuit are
integrated on the chip.
VT
VCC
25pF
20pF
2k
Ω
4
7
AM OSC
AM first oscillator.
This circuit can oscillator up to the
SW band.
An ALC circuit is included.
7
VCC
A L C
Continued on next page.
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