adv7344 Analog Devices, Inc., adv7344 Datasheet - Page 62

• Manufacturer Part Number: adv7344
• Description: Multiformat Video Encoder Six 14-bit Noise Shaped Video Dacs
• Manufacturer: Analog Devices, Inc.

ADV7344
SD ACTIVE VIDEO EDGE CONTROL
Subaddress 0x82, Bit 7
The ADV7344 is able to control fast rising and falling signals at
the start and end of active video in order to minimize ringing.
When the active video edge control feature is enabled
(Subaddress 0x82, Bit 7 = 1), the first three pixels and the last
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
0
100
–50
100
–50
50
50
0
0
2
Figure 82. Example of Video Output with Subaddress 0x82, Bit 7 = 0
Figure 83. Example of Video Output with Subaddress 0x82, Bit 7 = 1
Figure 81. Example of Active Video Edge Functionality
2
4
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4
6
87.5 IRE
12.5 IRE
100 IRE
50 IRE
0 IRE
6
F2
L135
F2
L135
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.
LUMA CHANNEL WITH
ACTIVE VIDEO EDGE
ENABLED
8
8
10
10
12
12