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參數(shù)資料
| 型號(hào)： | TDA4887 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 160 MHz bus-controlled monitor video preamplifier |
| 中文描述： | 160 MHz的總線控制顯示器的視頻前置放大器 |
| 文件頁數(shù)： | 45/68頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TDA4887 |
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2001 Oct 19
45
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
Calculation of compensation (see Fig.22):
1.
Gain adjustment is in 255 steps from 20 to 100%
which equates to 4.6 V per step at maximum contrast.
One step =
which is equal to
187 mV at the cathode with video gain = 13 for the
white area.
For 18.8% drive (used for black level adjustment) the
output changes only 2.7 mV (35 mV at the cathode)
per gain step.
2.
3.
The black level adjustment range (at feedback inputs)
is 1.9 V in 255 steps, which is 7.45 mV per step
(
black level of 97 mV at the cathode with feedback
gain =
1
13
). It follows that the optimum compensation
35
is one step black level for
or approximately
three steps of gain.
0.8
4.6 V
255
×
14.4 mV
=
97
2.8
=
handbook, full pagewidth
MHB953
FIXED
MAXIMUM
GAIN
4.6/0.7 V
PREAMPLIFIER
CONTRAST
40 dB
(0.5/100%)
255 steps
BRIGHTNESS
10/30%
of 4.6 V
255 steps
3
×
GAIN
20/100%
255 steps
VIDEO GAIN
≈
13
CRT
signal
amplitude
60 V (max.)
≈
25 V cut-off
level variation
4.6 V
(max.)
0.7 V
(nom.)
5.75
to 3.95 V
3
×
BLACK REFERENCES
range 1.9 V
255 steps
FEEDBACK GAIN
≈
1/13
Fig.22 Signal amplification and feedback references.
12.4.1.4
Example of automatic factory alignment
This procedure shows a realization of the alignment
description, it depends on disposable equipment.
Gamma = 2.25, maximum luminance = 102.8 cd/m
2
,
video gain = 13, feedback gain =
1
13
, white D; see Fig.23.
1.
Initialization
a) Set grid 2 voltage to minimum
b) Set R, G, B gains to the centre values (80H,
subaddresses 04H, 05H, 06H)
c) Set R, G, B black references to centre values (80H,
subaddresses 07H, 08H, 09H)
d) Set contrast to maximum (FFH, subaddress 02H).
2.
V
g2
and black levels
a) Set brightness to 18.8% drive (B8H,
subaddress 01H, control bit BRI=0)
b) Apply black video
c) Increase V
g2
manually until one colour appears
d) Activate the alignment computer
e) The computer will continuously adjust the R, G, B
black levels to meet the following three conditions:
x = 0.131
y = 0.329
the centre of the min/max setting remains at 80H
(this will leave some margin for the compensation
steps that follow)
f) Fine tuning of V
g2
(or V
g1
) until Y = 2.4 cd/m
2
with
the computer still active.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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