參數(shù)資料
型號(hào)： ADV7343BSTZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 68/108頁(yè)
文件大?。?/td> 0K
描述： IC ENCODER VIDEO W/DAC 64-LQFP
產(chǎn)品變化通告： ADV734x, ADV739x Feature Improvement
標(biāo)準(zhǔn)包裝： 1
類型： 視頻編碼器
應(yīng)用： DVD，Blu-Ray
電壓 - 電源，模擬： 3.3V
電壓 - 電源，數(shù)字： 1.8V
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(pán)
ADV7342/ADV7343
Data Sheet
Rev. | Page 62 of 108
SD gamma correction is enabled using Subaddress 0x88, Bit 6.
SD Gamma Correction Curve A is programmed at Subaddress
0xA6 to Subaddress 0xAF, and SD Gamma Correction Curve B
is programmed at Subaddress 0xB0 to Subaddress 0xB9.
Gamma correction is performed on the luma data only. The
user can choose one of two correction curves, Curve A or
Curve B. Only one of these curves can be used at a time. For
ED/HD gamma correction, curve selection is controlled using
Subaddress 0x35, Bit 4. For SD gamma correction, curve
selection is controlled using Subaddress 0x88, Bit 7.
The shape of the gamma correction curve is controlled by
defining the curve response at 10 different locations along the
curve. By altering the response at these locations, the shape of
the gamma correction curve can be modified. Between these
points, linear interpolation is used to generate intermediate
values. Considering that the curve has a total length of 256
points, the 10 programmable locations are at the following
points: 24, 32, 48, 64, 80, 96, 128, 160, 192, and 224. The
following locations are fixed and cannot be changed: 0, 16, 240,
and 255.
From the curve locations, 16 to 240, the values at the
programmable locations and, therefore, the response of the
gamma correction curve, should be calculated to produce the
following result:
xDESIRED = (xINPUT)γ
where:
xDESIRED is the desired gamma corrected output.
xINPUT is the linear input signal.
γ is the gamma correction factor.
To program the gamma correction registers, calculate the
10 programmable curve values using the following formula:
16
)
16
240
(
16
240
16
+
×
=
γ
n
where:
γn is the value to be written into the gamma correction register
for point n on the gamma correction curve.
n = 24, 32, 48, 64, 80, 96, 128, 160, 192, or 224.
γ is the gamma correction factor.
For example, setting γ = 0.5 for all programmable curve data
points results in the following yn values:
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 67 and Figure 68 are examples only;
any user-defined curve in the range from 16 to 240 is acceptable.
LOCATION
0
50
100
150
200
250
300
50
100
150
200
250
0.5
SIGNAL INPUT
G
AM
M
A
CO
RRE
CT
E
D
AM
P
L
IT
UDE
SIGNAL OUTPUT
GAMMA CORRECTION BLOCK OUTPUT TO A RAMP INPUT
06399-
071
Figure 67. Signal Input (Ramp) and Signal Output for Gamma 0.5
LOCATION
0
50
100
150
200
250
300
50
100
150
200
250
G
AM
M
A
CO
RRE
CT
E
D
AM
P
L
IT
UDE
GAMMA CORRECTION BLOCK TO A RAMP INPUT FOR
VARIOUS GAMMA VALUES
0.3
0.5
1.5
1.8
SIGN
AL
INP
UT
06399-
072
Figure 68. Signal Input (Ramp) and Selectable Output Curves
D
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