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參數資料

MC44724/5 Rev 0.21 03/25/97

No.

This document contains information on a new product. Specifications and information herein are subject to change without notice.

Chroma / Luma Encoding

The DVE de-multiplexes the 4:2:2 digital video data stream.

The de-multiplexed Y or Luma samples are interpolated (2X oversampled) at the clock rate. Offset

compensation is then added, next any VBI signals consisting of Closed-Caption, CGMS and WSS are

added to the appropriate lines, then finally composite sync pulses are added to the Luma signal.

(see figure 12.)

De-multiplexed component color CB and CR samples are interpolated (4X oversampled) at the clock rate.

Interpolating simplifies the output filter and allows more accurate encoding. The DVE generates the

necessary subcarrier color frequency for PAL or NTSC encoding from the 27Mhz system clock. This

color subcarrier is then modulated by the base band component color CB and CR signals to create the

video Chroma signal. (see figure 13.)

A 7.5 IRE pedestal is added for the 60Hz field rate. This can be added for the 50Hz field rate through

serial bus control. (see sub-address register descriptions)

CVBS and S-VIDEO or YCbCr or RGB Outputs

The internal digital video signals drive 10-bit D/A converters. Converter outputs are bi-directional current

sources where the current is proportional to the digital data with reference to the IBIAS reference current. The

pins CVBS/Cb/B, Y/G and C/Cr/R are the respective composite, Luma and Chroma or Y/Cb/Cr or R/G/B signal

current source pins. Also, each DACs can drive

75ohm

load register.

User can select 2 sets of signals within above 3 sets.

(see "Application Diagram" and "sub-address register descriptions".)

Bias Current Gain

DACs can be switched off through serial bus control to reduce power consumption. Both outputs of unused

DACs should be connected to ground through a resister to avoid charge buildup.

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