參數(shù)資料
型號(hào): LA1787M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: 14 X 14 MM, QFP-64
文件頁數(shù): 35/54頁
文件大?。?/td> 606K
代理商: LA1787M
AM high band cut and detector output level adjustment methods
The pin 31 AM and FM tuner output has an impedance of 10 k
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.
AM stereo system pins
No. 6655-40/54
LA1787M
Fig. 39
31
30
+
FM
detector
AM
detector
VCC
10 k
Noise
canceler
input
50 k
R31
C31
A12086
45
39
VCC
IFT
50 pF 150
IF AMP.
Keyed AGC
GND
To the AM stereo decoder
400 mV rms
450 kHz output
A11761
Fig. 40
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