ADV7150L

The ADV7150 (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 ADV7150 integrates a number of graphic functions onto one device allowing 24-bit direct True-Color operation at the maximum screen update rate of 220 MHz. The ADV7150 implements 30-bit True Color in 24-bit frame buffer designs. The part also supports other modes, including 15-bit True Color and 8-bit Pseudo or Indexed Color. Either the Red, Green or Blue input pixel ports can be used for Pseudo Color.

The device consists of three, high speed, 10-bit, video D/A converters (RGB), three 256 x 10 (one 256 x 30) color look-up tables, palette priority selects, a pixel input data multiplexer/ serializer and a clock generator/divider circuit. The ADV7150 is capable of 1:1, 2:1 and 4:1 multiplexing. The onboard palette priority select inputs enable multiple palette devices to be connected together for use in multipalette and window applications. The part is controlled and programmed through the microprocessor (MPU) port. The part also contains a number of onboard test registers, associated with self diagnostic testing of the device. The individual Red, Green and Blue pixel input ports allow True-Color, image rendition. True-Color image rendition, at speeds of up to 220 MHz, is achieved through the use of the onboard 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 24-bit True-Color resolution, while also allowing for the onboard implementation of linearization algorithms, such as Gamma-Correction. This allows effective 30-Bit True-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 differential outputs is all that is required to drive the CLOCK and CLOCK inputs of the ADV7150. The part can also be driven by an external clock generator chip circuit, such as the AD730.

The ADV7150 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 ADV7150 is fabricated in a +5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation.

The ADV7150 is packaged in a plastic 160-pin power quad flat-pack (QFP). Superior thermal dissipation is achieved by inclusion of a copper heatslug, within the standard package outline to which the die is attached.