TVP5146M2IPFPR datasheet(70/109 Pages) TI2

70 / 109 page

TVP5146M2

SLES141H

– JULY 2005 – REVISED FEBRUARY 2012

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Table 2-76. AGC White Peak Processing Register

Subaddress

74h

Default

00h

Luma peak A

Reserved

Color burst A

Sync height A

Luma peak B

Composite

Color burst B

Sync height B

peak

Luma peak A:

Use of the luma peak as a video amplitude reference for the back-end feed-forward type AGC algorithm

0 = Enabled (default)

1 = Disabled

Color burst A:

Use of the color burst amplitude as a video amplitude reference for the back-end

Note: Not available for SECAM, component, and B/W video sources.

0 = Enabled (default)

1 = Disabled

Sync height A:

Use of the sync height as a video amplitude reference for the back-end feed-forward type AGC algorithm

0 = Enabled (default)

1 = Disabled

Luma peak B:

Use of the luma peak as a video amplitude reference for front-end feedback type AGC algorithm

0 = Enabled (default)

1 = Disabled

Composite peak:

Use of the composite peak as a video amplitude reference for front-end feedback type AGC algorithm

Note: Required for CVBS and SCART (with color burst) video sources.

0 = Enabled (default)

1 = Disabled

Color burst B:

Use of the color burst amplitude as a video amplitude reference for front-end feedback type AGC algorithm

Note: Not available for SECAM, component, and B/W video sources

0 = Enabled (default)

1 = Disabled

Sync height B:

Use of the sync-height as a video amplitude reference for front-end feedback type AGC algorithm

0 = Enabled (default)

1 = Disabled

Note: If all 4 bits of the lower nibble are set to logic 1 (that is, no amplitude reference selected), then the front-end analog and digital

gains are automatically set to nominal values of 2 and 2304, respectively.

If all 4 bits of the upper nibble are set to logic 1 (that is, no amplitude reference selected), then the back-end gain is set automatically to

unity.

If the input sync height is greater than 100% and the AGC-adjusted output video amplitude becomes less than 100%, then the back-end

scale factor attempts to increase the contrast in the back end to restore the video amplitude to 100%.

Functional Description

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