AD5666

Quad, 16-Bit DAC with 5 ppm/°C On-Chip Reference in 14-Lead TSSOP AD5666 05298-001 FEATURES Low power quad 16-bit DAC 14-lead TSSOP On-chip 1.25 V/2.5 V, 5 ppm/°C reference Power down to 400 nA @ 5 V, 200 nA @ 3 V 2.7 V to 5.5 V power supply Guaranteed monotonic by design Power-on reset to zero scale or midscale 3 power-down functions Hardware LDAC with LDAC override function CLR function to programmable code SDO daisy-chaining option Rail-to-rail operation APPLICATIONS Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators FUNCTIONAL BLOCK DIAGRAM AD5666 LDAC SCLK SYNC INTERFACE LOGIC DIN SDO VDD VREFIN/VREFOUT INPUT REGISTER DAC REGISTER INPUT REGISTER DAC REGISTER INPUT REGISTER DAC REGISTER INPUT REGISTER POWER-ON RESET DAC REGISTER 1.25V/2.5V REF STRING DAC A BUFFER STRING DAC B BUFFER STRING DAC C BUFFER STRING DAC D BUFFER POWER-DOWN LOGIC LDAC CLR POR Figure 1. GND VOUTA VOUTB VOUTC VOUTD GENERAL DESCRIPTION The AD5666 is a low power, quad, 16-bit, buffered voltageoutput DAC. The part operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic by design. The AD5666 has an on-chip reference with an internal gain of 2. The AD5666-1 has a 1.25 V 5 ppm/°C reference, giving a full-scale output of 2.5 V; the AD5666-2 has a 2.5 V 5 ppm/°C reference, giving a full-scale output of 5 V. The on-board reference i...