Datasheet

TVP5158, TVP5157, TVP5156
SLES243G –JULY 2009–REVISED APRIL 2013 www.ti.com
Table 4-35. AGC White Peak Processing
Subaddress 2Dh
Default F2h
7 6 5 4 3 2 1 0
Composite
Luma peak A Reserved Color burst A Sync height A Luma peak B Color burst B Sync height B
peak
If all four 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.
If all four 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%.
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
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
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
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
58 Internal Control Registers Copyright © 2009–2013, Texas Instruments Incorporated
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