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參數(shù)資料
| 型號： | STV9212 |
| 廠商： | 意法半導體 |
| 英文描述： | Video Processor for CRT Monitors with PictureBooST |
| 中文描述： | 視頻處理器PictureBooST的CRT顯示器 |
| 文件頁數(shù)： | 12/34頁 |
| 文件大?。?/td> | 335K |
| 代理商： | STV9212 |
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Functional Description
STV9212
12/34
2.7
Video Insertion Pulse
The Video Insertion Pulse (VIP) creates an indent on the three video signals, timed with the positive
part of the BLKI signal. (See
Section 2.2: Video Blanking on page 8
). As its level is below the video
black level, it introduces a video “infra-black” level. The video infra-black level position versus
ground is then controlled in subsequent stages. In the absence of the blanking pulse on pin BLK,
the VIP is not inserted and the subsequent stages control the position of video black level.
Figure 12
shows the signal before and after insertion of the VIP. Two different VIP values are
programmable by bit
VIP
. Refer to
Section 4: Electrical Specifications
for values.
2.8
Output Stage
The output stage consists of an output clamp and a buffer. If a reduced output video amplitude and/
or a reduced infra-black level range is sufficient in the application, the V
CCP
can be lowered to 5V.
Figure 11: Drive Control
Figure 12: VIP Insertion
Before Drive Stage
After Drive Stage
V
Ref
V
Ref
One I2C-bus register
DRIVEx (x=1, 2 or 3)
per video channel
Video Black Level
Video Black Level
DRIVEx
=max
DRIVEx
=mid
DRIVEx
=min
VIP insertion
Video before
BLKI signal
Video Black Level
V
Ref
VIP insertion
Video after
Video Black Level
V
Ref
V
VIP
V
Ref
+V
VIP
Video Infra-black Level
Note: Identical for video channels 1, 2 and 3.
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