AD7249

a FEATURES Two 12-Bit CMOS DAC Channels with On-Chip Voltage Reference Output Amplifiers Three Selectable Output Ranges per Channel –5 V to +5 V, 0 V to +5 V, 0 V to +10 V Serial Interface 125 kHz DAC Update Rate Small Size: 16-Lead DIP or SOIC Low Power Dissipation APPLICATIONS Process Control Industrial Automation Digital Signal Processing Systems Input/Output Ports LC2MOS Dual 12-Bit Serial DACPORT® AD7249 FUNCTIONAL BLOCK DIAGRAM VDD VSS AD7249 REFOUT 2R ROFSA 2R REFIN 12-BIT DAC A A1 2R VOUTA ROFSB 2R AGND 12-BIT DAC B DGND INPUT SHIFT REGISTER A2 VOUTB GENERAL DESCRIPTION The AD7249 DACPORT contains a pair of 12-bit, voltageoutput, digital-to-analog converters with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No external trims are required to achieve full specified performance. The output amplifiers are capable of developing +10 V across a 2 kΩ load. The output voltage ranges with single supply operation are 0 V to +5 V or 0 V to +10 V, while an additional bipolar ± 5 V output range is available with dual supplies. The ranges are selected using the internal gain resistor. Interfacing to the AD7249 is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. The data stream consists of 16 bits, DB15 to DB13 are don’t care bits, the 13th bit (DB12) is used as the channel select bit and the remaining 12 bits (DB11 to DB0) contain the data to u...