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參數(shù)資料
| 型號： | 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： | 中頻信號處理集成電路PAL / NTSC制式多聲道音頻的電視機和錄像機系統(tǒng) |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 267K |
| 代理商： | LA75691 |
No. 5734-10/13
LA75691
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
IF AGC filter connection
The AGC voltage is created at pin 17 from the peak detection
output produced by the internal AGC detector. A second
AGC filter (a lag-lead filter) is built in the IC to create a dual
time constant.
Use a 0.022-μF capacitor as the external capacitor. Adjust
the value of the capacitor to compensate for sag, or modify
the AGC speed as required.
17
IF AGC FILTER
VIF amplifier input
The input circuit is a balanced input and the input impedance
corresponds to:
R
≈
1.5 k
and
C
≈
3 pF.
18
19
VIF input
RF AGC trimmer connection
This pin is used to set the tuner RF AGC operating point. The
FM and video outputs can be muted at the same time by
shorting this pin to ground.
20
GND
22
NC
21
RF AGC VR
Continued on next page.
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