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參數(shù)資料
| 型號： | STV9212 |
| 廠商： | 意法半導(dǎo)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)： | 8/34頁 |
| 文件大小： | 335K |
| 代理商： | STV9212 |
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Functional Description
STV9212
8/34
2.2
Video Blanking
The three video channels are simultaneously blanked with the high level of either BLKI or FBLK
signals. BLKI is an internal signal drawn from the signal applied on the BLK pin (H-flyback) as
shown in
Figure 3
. The blanking consists in forcing a “black” level to the internal clamped video
signal.
BLK Input
The BLK input receives an H-flyback pulse that drives:
G
the video blanking circuitry during scan line retrace,
G
the output clamping stage.
A clipping circuit at the input allows the direct use of a high-voltage H-flyback pulse applied through
a serial resistor as shown in
Figure 5
. A logic-level signal is also accepted but the serial resistor
remains mandatory. In all cases, the value of this resistor must be such that the sinking and
sourcing currents are limited to 1mA and 100μA, respectively.
Permanent Blanking
The entire TV screen can be blanked for an unlimited amount of time using the software blanking
feature. Both bits
SWBLK
and
TST1
must be set to 1. The three video outputs are forced to their
infra-black levels as shown in
Figure 6
. Infra-black levels are defined in
Section 2.9
.
Figure 5: BLK Input Pin
Figure 6: Software Blanking
GND
40 to
100V
0 to -10V
Typical
H-Flyback signal
GND
~3V
Signal at BLK pin
(Pin 24)
(*) R
lim
is necessary to limit currents flowing through BLK pin (-100uA, +1mA max.)
BLK
R
lim
(*)
24
Normal operation
SWBLK=0, TST1=0
Software blanking in operation
SWBLK=1, TST1=1
Black level
Infra-black level
Video output
channels 1,2,3
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