參數(shù)資料
型號(hào): LA1787M
廠(chǎng)商: Sanyo Electric Co.,Ltd.
英文描述: Single-Chip Tuner IC for Car Radios
中文描述: 單芯片調(diào)諧器IC的汽車(chē)收音機(jī)
文件頁(yè)數(shù): 40/54頁(yè)
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
VCC
10 k
Noise
canceler
input
50 k
R31
C31
A12086
45
39
VCC
VCC
IFT
50 pF150
IF AMP.
Keyed AGC
GND
To the AM stereo decoder
400 mV rms
450 kHz output
A11761
Fig. 40
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