ADV478| Datasheet

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FEATURES Personal System/2* Compatible 80 MHz Pipelined Operation Triple 8-Bit (6-Bit) D/A Converters 256 24(18) Color Palette RAM 15 24(18) Overlay Registers RS-343A/RS-170 Compatible Outputs Sync on All Three Channels Programmable Pedestal (0 or 7.5 IRE) External Voltage or Current Reference Standard MPU Interface +5 V CMOS Monolithic Construction 44-Pin PLCC Package Power Dissipation: 800 mW APPLICATIONS High Resolution Color Graphics CAE/CAD/CAM Applications Image Processing Instrumentation Desktop Publishing AVAILABLE CLOCK RATES 80 MHz 66 MHz 50 MHz 35 MHz GENERAL DESCRIPTION

CMOS 80 MHz Monolithic 256 24(18) Color Palette RAM-DACs ADV478/ADV471
FUNCTIONAL BLOCK DIAGRAM

OBS

OLE

The ADV478 (ADV ) and ADV471 are pin compatible and software compatible RAM-DACs designed specifically for Personal System/2 compatible color graphics. The ADV478 has a 256 24 color lookup table with triple 8-bit video D/A converters. It may be configured for either 6 bits or 8 bits per color operation. The ADV471 has a 256 18 color lookup table with triple 6-bit video D/A converters. Options on both parts include a programmable pedestal (0 or 7.5 IRE) and use of an external voltage or current reference.
ADV is a registered trademark of Analog Devices, Inc. *Personal System/2 is a trademark of International Business Machines Corp.

Fifteen overlay registers provide for overlaying cursors, grids, menus, EGA emulation, etc. Also supported is a pixel read mask register and sync generation on all three channels. The ADV478 and ADV471 generate RS-343A compatible video signals into a doubly terminated 75 load, and RS-170 compatible video signals into a singly terminated 75 load, without requiring external buffering. Differential and integral linearity errors are guaranteed to be a maximum of 1 LSB for the ADV478 and 1/4 LSB for the ADV471 over the full temperature range.

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