AD7244

a FEATURES Two 12-Bit/14-Bit DACs with Output Amplifiers AD7242: 12-Bit Resolution AD7244: 14-Bit Resolution On-Chip Voltage Reference Fast Settling Time AD7242: 3 ␮s to ؎1/2 LSB AD7244: 4 ␮s to ؎1/2 LSB High Speed Serial Interface Operates from ؎5 V Supplies Specified Over –40؇ C to +85؇ C in Plastic Packages Low Power – 130 mW typ LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs AD7242/AD7244 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION 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 (LC2MOS), 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...