ADV473 Datasheet | Analog Devices

FEATURES ADV478/ADV471 (ADV®) Register Level patible IBM PS/2,- VGA- /XGA- patible 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 patible Analog Outputs TTL patible 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 plete analog output, Video RAM-DAC on a single CMOS monolithic chip. The part is specifically designed for true-color puter 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 patible. 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 P I X E L P O R T OVERLAY PALETTE 15 x 8 RAM 15 x 8 RAM 15 x 8 RAM 8 8 8 COLOR PALETTE 8 8 8 VOLTAGE REFERENCE CONTROL CIRCUIT COLOR PALETTE/ OVERLAY PALETTE SWITCHER R0 R7 G0 G7 GREEN SWITCHING MATRIX & PIXEL MASK 8 8 RED 256 x 8 RAM D A C P O R T RED DAC GREEN DAC BLUE DAC GREEN 256 x 8 RAM BLUE 256 x 8 RAM BLUE B0 B7 CLOCK 8 MODE CONTROL REGISTERS PIXEL MASK REGISTERS RED REG 8 GREEN REG MPU PORT 8 8 BLUE REG ADDRESS REG MPU & PIXEL PORT CONTROL LOGIC CR0...