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參數資料
| 型號： | ADV7343 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat Video Encoder Six, 11-Bit, 297 MHz DACs |
| 中文描述： | 六多格式視頻編碼器，11位，297兆赫數模轉換器 |
| 文件頁數： | 57/88頁 |
| 文件大小： | 1053K |
| 代理商： | ADV7343 |
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ADV7342/ADV7343
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 the curve has a total length of 256 points,
the 10 programmable locations are at points 24, 32, 48, 64, 80,
96, 128, 160, 192, and 224. Locations 0, 16, 240, and 255 are
fixed and cannot be changed.
From 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:
x
DESIRED
= (
x
INPUT
)
γ
where:
x
DESIRED
is the desired gamma corrected output.
x
INPUT
is the linear input signal.
γ is the gamma correction factor.
Rev. 0 | Page 57 of 88
To program the gamma correction registers, calculate the
10 programmable curve values using the following formula:
16
)
16
240
(
16
240
16
+
×
=
γ
γ
n
n
where:
γ
n
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
y
n
values:
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 70 and Figure 71 are examples only;
any user-defined curve in the range from 16 to 240 is acceptable.
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 70. 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 71. Signal Input (Ramp) and Selectable Output Curves
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| ADV7343BSTZ | 功能描述:IC ENCODER VIDEO W/DAC 64-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7343WBSTZ | 功能描述:IC ENCODER VID 12BIT DAC 64LQFP 制造商:analog devices inc. 系列:- 包裝:托盤 零件狀態:在售 類型:視頻編碼器 應用:DVD，Blu-Ray 電壓 - 電源，模擬:2.6 V ~ 3.46 V 電壓 - 電源，數字:1.71 V ~ 1.89 V 安裝類型:表面貼裝 封裝/外殼:64-LQFP 供應商器件封裝:64-LQFP（10x10） 標準包裝:1 |
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| ADV7344BSTZ | 制造商:Analog Devices 功能描述: |
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