TVP70025IPZP datasheet(16/55 Pages) TI

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RGB-to-YCbCr Color Space Conversion

4:4:4 to 4:2:2 Conversion

TVP70025I

SLES232 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com

The TVP70025I supports RGB-to-YCbCr color space conversion (CSC) with I2C programmable coefficients. The

TVP70025I should default to the CSC coefficients required for HDTV component video inputs. The TVP70025I

supports the ability to bypass the CSC block and defaults to the bypass mode (bit 3of subaddress 23h).

RGB-to-YCbCr

CSC

coefficients

for

HDTV

component

video

(see

CEA-770.3-C,

ITU-R

BT.709)

(default coefficients):

00000016E3

000000024F

00000006CE

FFFFFFF3AB

0000001000

FFFFFFFC55

FFFFFFF178

FFFFFFFE88

0000001000

RGB-to-YCbCr

CSC

coefficients

for

SDTV

component

video

(see

CEA-770.2-C,

ITU-R

BT.601)

(informative only):

00000012C9

00000003A6

0000000991

FFFFFFF566

0000001000

FFFFFFFA9A

FFFFFFF29A

FFFFFFFD66

0000001000

For 4:4:4 YPbPr component video inputs, the TVP70025I can downsample the chroma samples (CbCr) from 1×

to 0.5× using a 27-tap half-band filter.

NOTE:

• Selection between the 30-bit 4:4:4 output format and the 20-bit 4:2:2 output format is made

using bit 1 of register 15h.

• Multiplexed CbCr data is output on BOUT [9:0] in the 20-bit 4:2:2 output format.

• 4:4:4 to 4:2:2 conversion is implemented after RGB-to-YCbCr color space conversion.

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