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参数资料
| 型号： | AD9398/PCBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD9398 |
| 标准包装： | 1 |
| 主要目的： | 视频，视频处理 |
| 已用 IC / 零件： | AD9398 |
| 已供物品： | 板 |
| 相关产品： | AD9398KSTZ-100-ND - IC INTERFACE 100MHZ HDMI 100LQFP AD9398KSTZ-150-ND - IC INTERFACE 150MHZ HDMI 100LQFP |
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AD9398
Rev. 0 | Page 11 of 44
4:4:4 TO 4:2:2 FILTER
The AD9398 contains a filter that allows it to convert a signal
from YCrCb 4:4:4 to YCrCb 4:2:2 while maintaining the
maximum accuracy and fidelity of the original signal.
Input Color Space to Output Color Space
The AD9398 can accept a wide variety of input formats and
either retain that format or convert to another. Input formats
supported are:
4:4:4 YCrCb 8-bit
4:2:2 YCrCb 8-, 10-, and 12-bit
RGB 8-bit
Output modes supported are:
4:4:4 YCrCb 8-bit
4:2:2 YCrCb 8-, 10-, and 12-bit
Dual 4:2:2 YCrCb 8-bit
Color Space Conversion (CSC) Matrix
The CSC matrix in the AD9398 consists of three identical
processing channels. In each channel, three input values are
multiplied by three separate coefficients. Also included are an
offset value for each row of the matrix and a scaling multiple for
all values. Each value has a 13-bit, twos complement resolution
to ensure the signal integrity is maintained. The CSC is
designed to run at speeds up to 150 MHz, supporting
resolutions up to 1080p at 60 Hz. With any-to-any color space
support, formats such as RGB, YUV, YCbCr, and others are
supported by the CSC.
The main inputs, RIN, GIN, and BIN come from the 8- to 12-bit
inputs from each channel. These inputs are based on the input
format detailed in Table 10. The mapping of these inputs to the
CSC inputs is shown in Table 8.
Table 8. CSC Port Mapping
Input Channel
CSC Input Channel
R/CR
RIN
Gr/Y
GIN
B/CB
B
IN
One of the three channels is represented in Figure 6. In each
processing channel, the three inputs are multiplied by three
separate coefficients marked a1, a2, and a3. These coefficients
are divided by 4096 to obtain nominal values ranging from
0.9998 to +0.9998. The variable labeled a4 is used as an offset
control. The CSC_Mode setting is the same for all three
processing channels. This multiplies all coefficients and offsets
by a factor of 2CSC_Mode.
The functional diagram for a single channel of the CSC, as
shown in Figure 6, is repeated for the remaining G and B
channels. The coefficients for these channels are b1, b2, b3, b4,
c1, c2, c3, and c4.
05678-
006
×2
2
1
0
×
a1[12:0]
a2[12:0]
a3[12:0]
RIN [11:0]
GIN [11:0]
BIN [11:0]
+
×4
CSC_Mode[1:0]
a4[12:0]
ROUT [11:0]
+
1
4096
×
1
4096
×
1
4096
×
+
Figure 6. Single CSC Channel
A programming example and register settings for several
common conversions are listed in the Color Space Converter
(CSC) Common Settings section.
For a detailed functional description and more programming
examples, refer to Application Note AN-795, AD9880 Color
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