ADV7390/ADV7391/ADV7392/ADV7393
SD ACTIVE VIDEO EDGE CONTROL
Subaddress 0x82, Bit 7
At the start of active video, the first three pixels are multiplied
by ⅛, ½, and ⅞, respectively. Approaching the end of active
video, the last three pixels are multiplied by ⅞, ½, and ⅛,
respectively. All other active video pixels pass through
unprocessed.
The ADV739x is 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.
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
DISABLED
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
100 IRE
0 IRE
100 IRE
87.5 IRE
50 IRE
12.5 IRE
0 IRE
Figure 83. Example of Active Video Edge Functionality
VOLTS
0.5
IRE:FLT
100
50
0
0
F2
L135
–50
2
0
4
6
8
10
12
Figure 84. Example of Video Output with Subaddress 0x82, Bit 7 = 0
VOLTS
IRE:FLT
100
50
0
0.5
0
F2
L135
–50
–2
0
2
4
6
8
10
12
Figure 85. Example of Video Output with Subaddress 0x82, Bit 7 = 1
Rev. 0 | Page 59 of 96
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