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TVP5147PFP Datasheet(PDF) 65 Page - Texas Instruments

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Part No. TVP5147PFP
Description  NTSC/PPAL SECAM 2 X 10 BIT DIGITAL VIDEO DECODER WITH MACROVISION DETECTION INPUT AND 5 LINE COMB FILTER
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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Functional Description
57
SLES099A—April 2004
TVP5147PFP
2.11.52 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 peak
Color burst B
Sync height B
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 the front-end feedback type AGC
algorithm.
0 = Enabled (default)
1 = Disabled
Composite peak: Use of the composite peak as a video amplitude reference for the 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 the 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 the 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%.




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