參數(shù)資料
型號： ADV7321KSTZ
廠商： Analog Devices Inc
文件頁數(shù)： 50/88頁
文件大?。?/td> 0K
描述： IC VID ENC 6-12BIT DAC'S 64LQFP
標(biāo)準(zhǔn)包裝： 1
類型： 視頻編碼器
應(yīng)用： EVD，DVD，SD/PS/HDTV
電壓 - 電源，模擬： 2.5V
電壓 - 電源，數(shù)字： 2.5V
安裝類型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 托盤
ADV7320/ADV7321
Rev. A | Page 54 of 88
For lengths of 16 to 240 points, the gamma correction curve is
calculated as follows:
y
= xγ
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
x
y
where:
x(n 16) = value for x along x-axis at points n.
n = 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224.
yn = value for y along the y-axis, which must be written into the
gamma correction register.
For example,
y24 = [(8/224)0.5 × 224] + 16 = 58
y32 = [(16/224)0.5 × 224] + 16 = 76
y48 = [(32/224)0.5 × 224] + 16 = 101
y64 = [(48/224)0.5 × 224] + 16 = 120
y80 = [(64/224)0.5 × 224] + 16 = 136
y96 = [(80/224)0.5 × 224] + 16 = 150
y128 = [(112/224)0.5 × 224] + 16 = 174
y160 = [(144/224)0.5 × 224] + 16 = 195
y192 = [(176/224)0.5 × 224] + 16 = 214
y224 = [(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 only examples;
any user-defined curve is acceptable in the range of 16 to 240.
LOCATION
0
50
100
150
200
250
300
50
100
150
200
250
0.5
SIGNAL INPUT
GAMMA
CORRE
CTE
D
AMP
LITUDE
SIGNAL OUTPUT
GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT
05067-071
Figure 71. Signal Input (Ramp) and Signal Output for Gamma 0.5
LOCATION
0
50
100
150
200
250
300
50
100
150
200
250
GAMMA
CORRE
CTE
D
AMP
LITUDE
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
VARIOUS GAMMA VALUES
0.3
0.5
1.5
1.8
SI
GN
AL
IN
PU
T
05067-072
Figure 72. Signal Input (Ramp) and Selectable Output Curves
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