ADV7152LS110 datasheet(23/32 Pages) AD

23 / 32 page

ADV7152

–23–

REV. B

Variations on RS-343A

Various other video output configurations can be implemented

by the ADV7152, including RS-170. Values of RSET for particu-

lar output video formats/levels are calculated by using the equa-

tions for RSET given in the “Pin Configuration” section. The

table shows calculated values of RSET for some of the most com-

mon variants on the RS-343A standard. The associated wave-

forms are shown in the diagrams.

RSET ( )

Video Signal

265

SYNC

decoded on IOG; Pedestal = 0 IRE

280

No SYNC decoded; Pedestal = 7.5 IRE

259

No SYNC decoded; Pedestal = 0 IRE

WHITE

LEVEL

IOR, IOB

IOG

26.67 1.000

0.698

18.62

8.05

0.302

BLACK/BLANK

LEVEL

SYNC

LEVEL

100 IRE

43 IRE

Figure 29. Composite Video Waveform (SYNC

Decoded on IOG; Pedestal = 0 IRE; RSET = 265 Ω)

WHITE LEVEL

BLACK LEVEL

IOR, IOB, IOG

19.05

0.714

1.44

0.054

BLANK LEVEL

92.5 IRE

7.5 IRE

Figure 30. Composite Video Waveform

(Pedestal = 7.5 IRE; RSET = 280 Ω)

WHITE LEVEL

IOR, IOB, IOG

19.05

0.714

BLACK/ BLANK

LEVEL

100 IRE

Figure 31. Composite Video Waveform

(Pedestal = 0 IRE; RSET = 259 Ω)

IPLL Synchronization Output Control

This output synchronization signal is used in applications where

it is necessary to synchronize multiple palette devices (ADV7150

+ ADV7151) to subpixel resolution. Each devices IPLL output

signal is in phase with its analog RGB output signal. If multiple

devices have differing output delays, the time difference can be

derived from the IPLL signals. This time difference is then used

to phase shift the CLOCK inputs on one or other of the devices

inputs.

The IPLL signal is internally triggered by either the falling edge

of SYNC or BLANK as determined by CR21 of Command

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