Datasheet
TVP5147M1
SLES140G –JULY 2005–REVISED FEBRUARY 2012
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Table 2-73. AGC White Peak Processing Register
Subaddress 74h
Default 00h
7 6 5 4 3 2 1 0
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 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%.
68 Functional Description Copyright © 2005–2012, Texas Instruments Incorporated
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