參數(shù)資料
型號(hào)： ADV7152LS110
廠商： ANALOG DEVICES INC
元件分類： 顯示控制器
英文描述： CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
中文描述： PALETTE-DAC DSPL CTLR, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 26/32頁
文件大?。?/td> 454K
代理商： ADV7152LS110
ADV7152
–26–
REV. B
APPE NDIX 3
10-BIT DACS AND GAMMA CORRE CT ION
10-Bit DACs
10-bit RAM-DAC resolution allows for nonlinear video correc-
tion, in particular Gamma Correction. T he ADV7152 allows for
an increase in color resolution from 24-bit to 30-bit effective
color without the necessity of a 30-bit deep frame buffer. In
true-color mode, for example, the part effectively operates as a
24-bit to 30-bit color look-up table.
Up to now we have assumed that there exists a linear relation-
ship between the actual RGB values input to a monitor and the
intensity produced on the screen. T his, however, is not the case.
Half scale digital input (1000 0000) might correspond to only
20% output intensity on the CRT (Cathode Ray T ube). T he in-
tensity (I
CRT
) produced on a CRT by an input value I
IN
is given
by:
I
CRT
=
(
I
IN
)
χ
where
χ
ranges from 2.0 to 2.8.
If the individual values of
χ
for red, green and blue are known,
then so called “Gamma Correction” can be applied to each of
the three video input signals (I
IN
);
therefore:
I
IN(corrected)
= k
(
I
IN
)
1/
χ
T raditionally, there has been a tradeoff between implementing a
nonlinear graphics function, such as gamma correction, and
color dynamic range. T he ADV7152 overcomes this by increas-
ing the individual color resolution of each of the red, green and
blue primary colors from 8 bits per color channel to 10 bits per
channel (24 bits to 30 bits).
T he table highlights the loss of resolution when 8-bit data is
gamma-corrected to a value of 2.7 and quantized in a tradi-
tional 8-bit system. Note that there is no change in the 8-bit
quantized data for linear changes in the input data over much of
the transfer function. On the other hand, when quantized to 10
bits via the 10-bit RAMs and 10-bit DACs of the ADV7152, all
changes on the input 8-bit data are reflected in corresponding
changes in the 10-bit data.
T he graph shows a typical gamma curve corresponding to a
gamma value of 2.7. T his is programmed to the red, green and
blue RAMs of the color lookup table instead of the more tradi-
tional linear function. Different curves corresponding to any
particular gamma value can be independently programmed to
each of the red, green and blue RAMs.
Other applications of the 10-bit RAM-DAC include closed-loop
monitor color calibration.
(k
= 1, normally)
Gamma Correction 8 Bits vs. 10 Bits
Gamma
Corrected
(2.7)
Quantized to
8 Bits
Quantized to
10 Bits
8-Bit Data
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
0.977797
0.979304
0.980807
0.982306
0.983801
0.985292
0.986780
0.988264
0.989744
0.991220
0.992693
0.994161
0.995626
0.997088
0.998546
1.000000
250
250
251
251
25 1
252
252
252
253
253
254
254
254
255
255
255
1001
1002
1004
1005
1007
1008
1010
1011
1013
1015
1016
1018
1019
1021
1022
1023
1.00
0.00
256
0.30
0.10
32
0.20
0
0.60
0.40
0.50
0.70
0.80
0.90
224
192
160
128
96
64
INPUT CODE – Decimal
D
GAMMACORRECTONCURVE
LNEARRESPONSEPRECEVED BYTHEEYE
CRTRESPONSE
Gamma Correction Curve (Gamma Value = 2.7)
相關(guān)PDF資料
PDF描述
ADV7152LS135 CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
ADV7152LS170 CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
ADV7152LS220 CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
ADV7160 96-Bit, 220 MHz True-Color Video RAM-DAC(96位,220MHz,真彩色視頻RAM-D/A轉(zhuǎn)換器)
ADV7162 96-Bit, 220 MHz True-Color Video RAM-DAC(96位,220MHz,真彩色視頻RAM-D/A轉(zhuǎn)換器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7152LS135 制造商:Rochester Electronics LLC 功能描述:- Bulk
ADV7152LS170 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
ADV7152LS220 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:PALETTE-DAC DSPL CTLR, PQFP100
ADV7152LS85 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC
ADV7160 制造商:AD 制造商全稱:Analog Devices 功能描述:96-Bit, 220 MHz True-Color Video RAM-DAC
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