ADV7151L

The ADV7151 (ADV*) is a complete analog output, Video RAM-DAC on a single CMOS monolithic chip. The part is specifically designed for use in high performance, color graphics workstations. The ADV7151 integrates a number of graphic functions onto one device allowing 8-bit Pseudo-Color (Indexed Color) operation at the maximum screen update rate of 220 MHz.

The device consists of three, high speed, 10-bit, video D/A converters (RGB),three 256x10 (one 256x30) color look-up tables, palette priority selects, a pixel input data multiplexer/serializer and a clock generator/divider circuit. The ADV7151 is capable of 1:1, 2:1 and 4:1 multiplexing. The on-board palette priority select inputs enable multiple palette devices to be connected together for using in multipalette and window applications. The part is controlled and programmed through the microprocessor (MPU) port. The part also contains a number of on-board test registers, associated with self diagnostic testing of the device.

Indexed-Color image rendition, at speeds of up to 220 MHz, is achieved through the use of the on-board data multiplexer/serializer. The pixel input port's flexibility allows for direct interface to most standard frame buffer memory configurations.

The 30 bits of resolution associated with the color look-up table and triple 10-bit DAC, realizes 8-bit Indexed-Color resolution, while also allowing for the on-board implementation of linearization algorithms, such as Gamma Correction. This allows effective 10-bit Indexed-Color operation.

The on-chip video clock controller circuit generates all the internal clocking and some additional external clocking signals. An external ECL oscillator source with different outputs is all that is required to drive the CLOCK and CLOCK inputs of the ADV7152. The part can also be driven by an external clock generator chip circuit, such as the AD730.

The ADV7151 is capable of generating RGB video output signals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering.

Test diagnostic circuitry has been included to complement the users system level debugging.

The ADV7151 is fabricated in a -5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation.

The ADV7151 is packaged in a plastic 100-pin quad flatpack (QFP). Superior thermal dissipation is achieved by inclusion of a copper heatslug, within the standard package outline to which the die is attached.