AD9889 Analog Devices, AD9889 Datasheet - Page 16

• Manufacturer Part Number: AD9889
• Description: High Performance HDMI/DVI Transmitter
• Manufacturer: Analog Devices

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DataSheet
AD9889
COLOR SPACE CONVERSION MATRIX (CSC)
The color space conversion matrix in the AD9889 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 is 13-bit, twos
complement resolution to ensure the signal integrity is
maintained. The CSC is designed to run at speeds up to
80 MHz supporting resolutions up to 1080i at 60 Hz and UXGA
at 60 Hz. With any-to-any color space support, RGB, YUV,
YCbCr, and other formats are supported by the CSC.
The main inputs, R
inputs from each channel. These inputs are based on the input
format detailed in Table 10 to Table 16. The mapping of these
inputs to the CSC inputs is shown in Table 17.
Table 17. CSC Port Mapping
Input Channel
R/Cr
Gr/Y
B/Cb
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IN
, G
IN
, and B
IN
CSC Input Channel
R
G
B
come from the 8-bit to 12-bit
IN
IN
IN
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Rev. 0 | Page 16 of 48
One of the three channels is represented in Figure 7. 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 per
Figure 7 is repeated for the remaining G and B channels. The co-
efficients for these channels are b1, b2, b3, b4, c1, c2, c3, and c4.
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 AN-795, The AD9880 Color Space Converter
User's Guide.
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