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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)： | 15/34頁 |
| 文件大小： | 335K |
| 代理商： | STV9212 |
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STV9212
Functional Description
2.9
Output Infra-black Level, Cut-off and Brightness
The schematic diagram of these functions is shown in
.
2.9.1
Output Infra-black Level
The infra-black level of the video signal at the video outputs OUT1, OUT2 and OUT3 is positioned
to the V
ib
reference by the output clamp circuit, thus defining the Output infra-black level. If the
output clamp circuit is furnished with a correctly timed OCP (see corresponding sections), the
output infra-black level equals V
ib
. V
ib
is composed of a fixed DC voltage (V
ibmin
), a variable DC
voltage (V
ibof
) applied on all three channels and a per-channel variable DC voltage (V
ibl
(1,2,3)) as
shown in
Figure 15
. In AC-coupling mode (bit MOD = 1), the V
ibl
part is suppressed and the V
ib
is
therefore equal on all three channels, only varying with bits IBOF[5:0] acting on V
ibof
. This can be
used to match the device’s outputs to the input of the video amplifier used (biasing). In DC-coupling
mode (bit
MOD
= 0), V
ibl
(1,2,3) are separately set via bits
IBL1[7:0]
,
IBL2[7:0]
and
IBL3[7:0]
,
respectively. This serves to adjust the cut-off points of the three CRT cathodes. In this case, V
ibof
can serve to pre-position the cut-off ranges in the factory adjustment procedure or/and to provide a
rough brightness control.
Figure 14: Cut-off and Brightness Control Block Diagram
DC
AC:1
DC:0
MOD
Output stage
V
ibmin
V
iblDC
Cut-off
Cut-off
IBLRG
Brightness
range
range
range
IBOF
1 for 3 channels
1 for 3 channels
1 per channel
Channel 3
Only
BRIG
CO1
CO2
CO3
OUT1
OUT2
OUT3
V
ib
DC
DC:0
AC:1
V
ib
V
Ref
V
COmin
Note: Identical for CO1, CO2 and CO3 outputs except for “brightness” (V
briDC
) that is only output at CO3 while MOD=0.
The switches are drawn in their default positions.
* ~0V when the output is left open
V
iblAC
V
briAC
V
briDC
V
CO
GND
BRIGRG
I2C-bus field
IBL1
IBL3
V
CO
V
COmax
V
COmin
MOD
=1
MOD
=0
Video DC level
~40k
V
iblAC
V
briAC
V
briDC
~0V*
Ch3 Ch1
Ch2
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