Datasheet

ADV7390/ADV7391/ADV7392/ADV7393 Data Sheet
Rev. J | Page 64 of 107
SD ACTIVE VIDEO EDGE CONTROL
Subaddress 0x82, Bit 7
The ADV7390/ADV7391/ADV7392/ADV7393 are able to
control fast rising and falling signals at the start and end of
active video to minimize ringing.
When the active video edge control feature is enabled
(Subaddress 0x82, Bit 7 = 1), the first three pixels and the last
three pixels of the active video on the luma channel are scaled
so that maximum transitions on these pixels are not possible.
At the start of active video, the first three pixels are multiplied
by 1/8, 1/2, and 7/8, respectively. Approaching the end of active
video, the last three pixels are multiplied by 7/8, 1/2, and 1/8,
respectively. All other active video pixels pass through
unprocessed.
100 IRE
0 IRE
100 IRE
12.5 IRE
87.5 IRE
0 IRE
50 IRE
LUMA CHANNE
L
WITH
ACTIVE VIDEO EDGE
DISABLED
LUM
A
CHANNE
L
WITH
AC
TIVE VIDEO EDGE
ENABLED
06234-083
Figure 82. Example of Active Video Edge Functionality
VOLTS
0 2 4
F2
L135
6 8 10 12
IRE:FLT
–50
0
0
50
100
0.5
06234-084
Figure 83. Example of Video Output with Subaddress 0x82, Bit 7 = 0
VOLTS
0 2–2 4 6 8 10 12
F2
L135
IRE:FLT
–50
0
50
100
0
0.5
06234-085
Figure 84. Example of Video Output with Subaddress 0x82, Bit 7 = 1
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