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參數資料
| 型號： | TDA4887PS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 160 MHz bus-controlled monitor video preamplifier |
| 中文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | 0.400 INCH, PLASTIC, SDIP-24 |
| 文件頁數： | 46/68頁 |
| 文件大小： | 425K |
| 代理商： | TDA4887PS |
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2001 Oct 19
46
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
3.
R, G, B gains (white point)
a) Set brightness at nominal (40H)
b) Apply full video white area (700 mV)
c) Activate the computer
d) The computer will adjust the R, G, B gains to meet
the following three conditions:
x = 0.313
y = 0.329
Y = 102.8 cd/m
2
For each 3 (2.8) gain increments, the computer will
decrement the black references by one step.
The effect on cathode voltages is demonstrated in Fig.23.
After step 2 the voltages at 18.8% drive are correct but not
those at 100% drive (white) and 0% (black). After step 3
the voltages at 18.8% drive have not changed but white as
well as black voltages are correct now. Any brightness
setting (
10 to +30%) relates to the individual maximum
video amplitude (black-to-white).
This alignment procedure is adaptable to DC-coupled as
well as AC-coupled cathodes.
handbook, full pagewidth
MHB954
Black level references
adjusted with 18.8% drive
and gain set to 80H.
step 1:
Black level references
and gain set to 80H.
10
0
20
30
40
50
60
70
80
cut-off voltage range
from black level
references
(13
×
5.75 to 13
×
3.95)
black
white
18.8%
step 3:
Gain adjustment at 100% white with
automatic black level reference correction.
Cathode voltages for 18.8% drive left
unchanged.
cathode
voltage
(V)
Fig.23 Automatic factory alignment.
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