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參數(shù)資料
| 型號(hào)： | LA75691 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | IF Signal-Processing IC for PAL/NTSC Multichannel Audio TV and VCR Systems |
| 中文描述： | 中頻信號(hào)處理集成電路PAL / NTSC制式多聲道音頻的電視機(jī)和錄像機(jī)系統(tǒng) |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | LA75691 |
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No. 5734-7/13
LA75691
Pin Descriptions
Pin No.
Pin
Function
Equivalent circuit
SIF input
The input impedance is about 1 k
. The pattern layout for
the input circuit for this pin must be designed carefully, since
buzzing and/or beating can be caused by interference
signals. Video signals, the chrominance signal, and the VIF
carrier signal can cause interference in the audio signal.
1
SIF INPUT
The FM detector signal-to-noise ratio can be improved by
inserting a filter in the FM detector bias line.
C1 must be at least 0.47 μF, and 1 μF is recommended.
If the FM detector is not used, insert a 2-k
resistor between
pin 2 and ground. This stops the FM detector VCO.
2
FM power supply filter
Pin 3 is the first SIF output.
This is the output pin for the audio carrier to which P/S
separate detection has been applied. This is an emitter-
follower output with a 200
series resistor inserted.
3
First SIF output
Continued on next page.
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