The AD7242/AD7244 is a fast， complete， dual 12-bit/14-bit voltage output D/A converter. It consists of a 12-bit/14-bit DAC， 3 V buried Zener reference， DAC output amplifiers and high speed serial interface logic. Interfacing to both DACs is serial， minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. Asynchronous control of DAC updating for both DACs is made possible with a separate LDAC input for each DAC. The AD7242/AD7244 operates from ±5 V power supplies， providing an analog output range of ±3 V. A REF OUT/REF IN function allows the DACs to be driven from the on-chip 3 V reference or from an external reference source. The AD7242/AD7244 is fabricated in Linear Compatible CMOS （LC2 MOS）， an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin， 0.3-inch wide， plastic or hermetic dual-in-line package （DIP） and in a 28-pin， plastic small outline （SOIC） package. The AD7242 and AD7244 are available in the same pinout to allow easy upgrade from 12-bit to 14-bit performance.