ADV473

a FEATURES ADV478/ADV471 (ADV®) Register Level Compatible IBM PS/2,* VGA*/XGA* Compatible 135 MHz Pipelined Operation Triple 8-Bit D/A Converters Triple 256 ؋ 8 (256 ؋ 24) Color Palette RAM Three 15 ؋ 8 Overlay Registers On-Board Voltage Reference RS-343A/RS-170 Compatible Analog Outputs TTL Compatible Digital Inputs and Outputs Sync on All Three Channels Programmable Pedestal (0 or 7.5 IRE) Standard MPU l/O Interface +5 V CMOS Monolithic Construction 68-Pin PLCC Package APPLICATIONS High Resolution Color Graphics True-Color Visualization CAE/CAD/CAM Image Processing Desktop Publishing CMOS 135 MHz True-Color Graphics Triple 8-Bit Video RAM-DAC ADV473 MODES 24-Bit True Color 8-Bit Pseudo Color 15-Bit True Color 8-Bit True Color SPEED GRADES 135 MHz, 110 MHz 80 MHz, 66 MHz GENERAL DESCRIPTION The ADV473 is a complete analog output, Video RAM-DAC on a single CMOS monolithic chip. The part is specifically designed for true-color computer graphics systems. The ADV473 integrates a number of graphic functions onto one device allowing 24-bit direct true-color operation at the maximum screen update rate of 135 MHz. It can also be used in other modes, including 15-bit true color and 8-bit pseudo or indexed color. The ADV473 is fully PS/2 and VGA register level compatible. It is also capable of implementing IBM’s XGA standard. (Continued on page 4) FUNCTIONAL BLOCK DIAGRAM VREFIN SYNC BLANK S0 S1 VREFOUT VOLTAGE REFERENCE GENERATOR OL0 OVERLAYS OL3 4 P I X E L P O R T OVERLAY P...