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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(jī)和錄像機(jī)系統(tǒng) |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 267K |
| 代理商： | LA75691 |
No. 5734-11/13
LA75691
Pin No.
Pin
Function
Equivalent circuit
This filter is used to hold the FM detector output DC voltage
fixed.
Normally, a 1-μF electrolytic capacitor should be used.
The value of this capacitor can be increased to improve the
low band (around 50 Hz) frequency characteristics.
23
FM filter
Audio FM detector output
This is an emitter follower output with a 200-
resistor
inserted in series.
Stereo applications
Some applications may find that the stereo decoder input has
a low input impedance, and that the left and right signals are
distorted, i.e. that the stereo characteristics are degraded. If
that is a problem, add the resistor R1 shown in the figure
between pin 24 and ground.
R1
≥
5.1 k
Mono applications
Use an external deemphasis circuit with the following time
constant:
t = 2RC
24
FM Detector output
Continued from preceding page.
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