AD9398SLASHPCB datasheet(11/44 Pages) AD

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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

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.

×2

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]

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

Space Converter User's Guide.

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