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參數(shù)資料
型號: 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): 6/48頁
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-14/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
44
IF AGC
G1 ; Used for time constant switching
during seeks.
Reception
τ = 2.2μF × 300kΩ
Seek
τ = 2.2μF × 10Ω
The external capacitors are
connected to VCC.
This is because the IF amplifier
operates referenced to VCC.
+
42
DET
44
VCC
C
2.2
μF
0.022
μF
50k
Ω
50k
Ω
240k
Ω
G1
10
Ω
SEEK
ON
IF
AGC
45
IF output
The IF amplifier load
45
DET
Pin 40 VCC
46
AM antenna damping
drive output
Wide band AGC input
I46 = 6mA (maximum)
This is the antenna damping
current.
46
VCC
50pF
100
Ω
20k
Ω
ANT DAMPING
DRIVER
W.AGC AMP.
47
FM muting on level adjustment
Modify the value of the external
resistor to adjust the muting on level.
47
+
--
Inverter
VCC
30k
Ω
R
140
μA
Pin 24
MUTE
Continued on next page.
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相關(guān)代理商/技術(shù)參數(shù)
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