CMOS 80 MHz Monolithic 256 x 24(18) Color Palette RAM-DACs
a
CMOS 80 MHz Monolithic 256 ؋ 24(18) Color Palette RAM-DACs
ADV478/ADV471
FEATURES Personal System/2* Compatible
FU...
Description
a
CMOS 80 MHz Monolithic 256 ؋ 24(18) Color Palette RAM-DACs
ADV478/ADV471
FEATURES Personal System/2* Compatible
FUNCTIONAL BLOCK DIAGRAM
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
OAPPLICATIONS BHigh Resolution Color Graphics SCAE/CAD/CAM Applications
Image Processing
OInstrumentation
Desktop Publishing
LAVAILABLE CLOCK RATES E80 MHz T66 MHz E50 MHz
35 MHz
GENERAL DESCRIPTION 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 sy...
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