ADI ADV476KN40

The ADV476 (ADV) is a pin compatible and software compatible RAM - DAC designed specifically for VGA and Personal System/2 color graphics. The ADV476 is a complete analog output RAM - DAC on a single monolithic chip. The part contains a 256×18 color lookup table, a pixel mask register as well as a triple 6 - bit video D/A converter. The ADV476 is capable of simultaneously displaying up to 256 colors, from a total color palette of 262,144 addressable colors. The on - chip asynchronous MPU bus allows access to the color lookup table without affecting the input video data via the pixel port. The pixel read mask register provides a convenient way of altering the displayed colors without updating the color lookup table. The ADV476 is capable of generating RGB video output signals which are compatible with RS - 343A and RS - 170 video standards, without requiring external buffering. The ADV476 is fabricated in a +5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation and small board area. The part is packaged in a 0.6", 28 - pin DIP and a 44 - pin PLCC.

• Standard video refresh rates, 35 MHz, 50 MHz and 66 MHz.
• Fully compatible with VGA and Personal System/2 color graphics.
• Guaranteed monotonic. Integral and differential linearity guaranteed to be a maximum of ± 1 LSB.
• Low glitch energy, 75 pV secs.