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(yè)數(shù): 30/48頁(yè)
文件大?。?/td> 508K
代理商: LA1781M
LA1781M
No.6038-36/48
AM high band cut and detector output level adjustment methods
The pin 31 AM and FM tuner output has an impedance of 10k
Ω in AM mode and a few tens of Ohms in FM mode.
Therefore, R31 is used to lower the AM detector output level and C31 determines the AM high band frequency
characteristics.
Fig. 39
AM stereo system pins
Fig. 40
31
30
+
FM
detector
AM
detector
VCC
10k
Ω
Noise
canceler
input
50k
Ω
R31
C31
45
39
VCC
IFT
50pF 150Ω
IF AMP.
KEYED AGC
GND
To the AM stereo decoder
400mVrms
450kHz output
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