參數(shù)資料
型號(hào)： ADV7321KSTZ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 顏色信號(hào)轉(zhuǎn)換
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： LEAD FREE, PLASTIC, MS-026BCD, LQFP-64
文件頁(yè)數(shù)： 54/88頁(yè)
文件大小： 1002K
代理商： ADV7321KSTZ
ADV7320/ADV7321
For the length of 16 to 240, the gamma correction curve has to
be calculated as follows:
Rev. 0 | Page 54 of 88
y
=
x
γ
where:
y
= gamma corrected output
x
= linear input signal
γ = gamma power factor
To program the gamma correction registers, calculate the seven
values for
y
using the following formula:
16
)
16
240
(
)
16
240
(
)
16
(
+
×
γ
=
n
n
x
y
where:
x
(
n
16)
= Value for x along x axis at points
n
= 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224
y
n
= value for y along the y axis, which must be written into the
gamma correction register
For example,
y
24
= [(8/224)0.5 × 224] + 16 = 58
y
32
= [(16/224)0.5 × 224] + 16 = 76
y
48
= [(32/224)0.5 × 224] + 16 = 101
y
64
= [(48/224)0.5 × 224] + 16 = 120
y
80
= [(64/224)0.5 × 224] + 16 = 136
y
96
= [(80/224)0.5 × 224] + 16 = 150
y
128
= [(112/224)0.5 × 224] + 16 = 174
y
160
= [(144/224)0.5 × 224] + 16 = 195
y
192
= [(176/224)0.5 × 224] + 16 = 214
y
224
= [(208/224)0.5 × 224] + 16 = 232
where the sum of each equation is rounded to the nearest
integer.
The gamma curves in Figure 71 and Figure 72 are examples only;
any user-defined curve is acceptable in the range of 16 to 240.
LOCATION
00
50
100
150
200
250
300
50
100
150
200
250
0.5
SIGNAL INPUT
G
SIGNAL OUTPUT
GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT
0
Figure 71. Signal Input (Ramp) and Signal Output for Gamma 0.5
LOCATION
00
50
100
150
200
250
300
50
100
150
200
250
G
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
VARIOUS GAMMA VALUES
0.3
0.5
1.5
1.8
SGNALINPUT
0
Figure 72. Signal Input (Ramp) and Selectable Output Curves
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