adv7310 Analog Devices, Inc., adv7310 Datasheet - Page 54

• Manufacturer Part Number: adv7310
• Description: Multiformat 216 Mhz Video Encoder With Six Nsv 12-bit Dacs
• Manufacturer: Analog Devices, Inc.

ADV7310/ADV7311
SD ACTIVE VIDEO EDGE
[Subaddress 42h, Bit 7]
When the active video edge is enabled, the first three pixels and
the last three pixels of the active video on the luma channel are
scaled in such a way that maximum transitions on these pixels
are not possible. The scaling factors are ×1/8, ×1/2, and × 7/8.
All other active video passes through unprocessed.
VOLTS
VOLTS
100 IRE
–2
0
0 IRE
0.5
0.5
0
0
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
DISABLED
IRE:FLT
IRE:FLT
Figure 52. Example of Active Video Edge Functionality
0
100
–50
100
–50
50
50
0
0
2
Figure 53. Address 0x42, Bit 7 = 0
Figure 54. Address 0x42, Bit 7 = 1
2
4
4
–54–
6
87.5 IRE
12.5 IRE
100 IRE
50 IRE
SAV/EAV Step Edge Control
The ADV7310/ADV7311 has the capability of controlling fast
rising and falling signals at the start and end of active video to
minimize ringing.
An algorithm monitors SAV and EAV and governs when the
edges are too fast. The result will be reduced ringing at the start
and end of active video for fast transitions.
Subaddress 0x42, Bit 7 = 1 enables this feature.
0 IRE
6
F2
L135
F2
L135
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
8
8
10
10
12
12
REV. A