AD7302

a FEATURES Two 8-Bit DACs In One Package 20-Lead DIP/SOIC/TSSOP Package +2.7 V to +5.5 V Operation Internal and External Reference Capability DAC Power-Down Function Parallel Interface On-Chip Output Buffer Rail-to-Rail Operation Low Power Operation 3 mA max @ 3.3 V Power-Down to 1 ␮ A max @ 25؇ C APPLICATIONS Portable Battery Powered Instruments Digital Gain and Offset Adjustment Programmable Voltage and Current Sources Programmable Attenuators 2.7 V to 5.5 V, Parallel Input Dual Voltage Output 8-Bit DAC AD7302 FUNCTIONAL BLOCK DIAGRAM AD7302 INPUT REGISTER DAC REGISTER I DAC A I/V VOUTA D7 D0 A/B WR CS INPUT REGISTER DAC REGISTER I DAC B I/V VOUTB CONTROL LOGIC MUX POWER ON RESET ÷2 AGND PD CLR LDAC REFIN VDD DGND GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7302 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. The AD7302 has a parallel microprocessor and DSP-compatible interface with high speed registers and double buffered interface logic. Data is loaded to the registers on the rising edge of CS or WR and the A/B pin selects either DAC A or DAC B. Reference selection for AD7302 can be either an internal reference derived from the VDD or an external reference applied at the REFIN pin. Both DACs can be simultaneously updated using the asynchronous LDAC input and can be cleared by using the asynchronous CLR input. The low power consumption...