ADV7393 datasheet(59/96 Pages) AD

59 / 96 page

ADV7390/ADV7391/ADV7392/ADV7393

Rev. 0 | Page 59 of 96

SD ACTIVE VIDEO EDGE CONTROL

Subaddress 0x82, Bit 7

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.

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.

100 IRE

0 IRE

100 IRE

12.5 IRE

87.5 IRE

0 IRE

50 IRE

LUMA CHANNEL WITH

ACTIVE VIDEO EDGE

DISABLED

LUMA CHANNEL WITH

ACTIVE VIDEO EDGE

ENABLED

Figure 83. Example of Active Video Edge Functionality

VOLTS

024

L135

IRE:FLT

–50

100

0.5

Figure 84. Example of Video Output with Subaddress 0x82, Bit 7 = 0

VOLTS

–2

L135

IRE:FLT

–50

100

0.5

Figure 85. Example of Video Output with Subaddress 0x82, Bit 7 = 1

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