AD7303

a FEATURES Two 8-Bit DACs in One Package 8-Pin DIP/SOIC and microSOIC Packages +2.7 V to +5.5 V Operation Internal & External Reference Capability Individual DAC Power-Down Function Three-Wire Serial Interface QSPI™, SPI™ and Microwire™ Compatible On-Chip Output Buffer Rail-to-Rail Operation On-Chip Control Register Low Power Operation: 2.3 mA @ 3.3 V Full Power-Down to 1 ␮ A max, typically 80 nA APPLICATIONS Portable Battery Powered Instruments Digital Gain and Offset Adjustment Programmable Voltage and Current Sources Programmable Attenuators +2.7 V to +5.5 V, Serial Input, Dual Voltage Output 8-Bit DAC AD7303 FUNCTIONAL BLOCK DIAGRAM AD7303 INPUT REGISTER DAC REGISTER I DAC A I/V VOUT A INPUT REGISTER DAC REGISTER I DAC B I/V VOUT B DATA (8) DIN SCLK SYNC CONTROL (8) MUX POWER ON RESET ÷2 16-BIT SHIFT REGISTER GND REF VDD GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7303 is a dual, 8-bit voltage out DAC that operates from a single +2.7 V to +5.5 V supply. Its on-chip precision output buffers allow the DAC outputs to swing rail to rail. This device uses a versatile 3-wire serial interface that operates at clock rates up to 30 MHz, and is compatible with QSPI, SPI, microwire and digital signal processor interface standards. The serial input register is sixteen bits wide; 8 bits act as data bits for the DACs, and the remaining eight bits make up a control register. The on-chip control register is used to address the relevant DAC, to power down the complete de...