Datasheet

TVP5158, TVP5157, TVP5156
www.ti.com SLES243G –JULY 2009–REVISED APRIL 2013
Table 4-36. Back-End AGC Control
Subaddress 2Eh
Default 08h
7 6 5 4 3 2 1 0
Reserved 1 Peak Color Sync
This register allows disabling the back-end AGC when the front-end AGC uses specific amplitude references (sync-height, color burst or
composite peak) to decrement the front-end gain. For example, writing 09h to this register disables the back-end AGC whenever the front-
end AGC uses the sync-height to decrement the front-end gain.
Peak
Disables back-end AGC when the front-end AGC uses the composite peak as an amplitude reference.
0 Enabled (default)
1 Disabled
Color
Disables back-end AGC when the front-end AGC uses the color burst as an amplitude reference.
0 Enabled (default)
1 Disabled
Sync
Disables back-end AGC when the front-end AGC uses the sync height as an amplitude reference.
0 Enabled (default)
1 Disabled
Table 4-37. AFE Fine Gain
Subaddress 34h-35h
Default 086Ah
Subaddress 7 6 5 4 3 2 1 0
34h FGAIN [7:0]
35h Reserved FGAIN [13:8]
FGAIN [13:0]
This fine gain applies to CVBS. Fine Gain = (1/2048) × FGAIN where 0 ≤ FGAIN ≤ 16383. This register works only in manual gain
control mode. When AGC is active, writing to any value is ignored.
00 0000 0000 0000 to
Reserved
00 0011 1111 1111
00 0100 0000 0000 0.5
00 1000 0000 0000 1
00 1000 0110 1010 1.052 (default)
00 1100 0000 0000 1.5
11 1111 1111 1111 7.9995
Copyright © 2009–2013, Texas Instruments Incorporated Internal Control Registers 59
Submit Documentation Feedback
Product Folder Links: TVP5158 TVP5157 TVP5156