AD5678 Datasheet | Analog Devices

ATURES Low power octal DAC with Four 16-bit DACs Four 12-bit DACs 14-lead/16-lead TSSOP On-chip 1.25 V/2.5 V, 5 ppm/°C reference Power down to 400 n A @ 5 V, 200 n A @ 3 V 2.7 V to 5.5 V power supply Guaranteed monotonic by design Power-on reset to zero scale 3 power-down functions Hardware LDAC and LDAC override function CLR function to programmable code Rail-to-rail operation LDAC INPUT REGISTER INPUT REGISTER SCLK INTERFACE LOGIC INPUT REGISTER INPUT REGISTER INPUT REGISTER INPUT REGISTER INPUT REGISTER INPUT REGISTER POWER-ON RESET LDAC1 CLR1 1RU-16 FUNCTIONAL BLOCK DIAGRAM VDD VREFIN/VREFOUT 1.25V/2.5V REF DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER DAC REGISTER STRING DAC A STRING DAC B STRING DAC C STRING DAC D STRING DAC E STRING DAC F STRING DAC G STRING DAC H BUFFER VOUTA BUFFER VOUTB BUFFER VOUTC SYNC BUFFER VOUTD BUFFER VOUTE BUFFER VOUTF BUFFER VOUTG BUFFER VOUTH POWER-DOWN LOGIC GND 05299-001 APPLICATIONS Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage current sources Programmable attenuators PACKAGE ONLY Figure 1. GENERAL DESCRIPTION The AD5678 is a low power, octal, buffered voltage-output DAC with four 12-bit DACs and four 16-bit DACs in a single package. All devices operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design. The AD5678 has an on-chip reference with an internal gain of 2. The AD5678-1 has a 1.25 V 5 ppm/°C reference, giving a fullscale output of 2.5 V; the AD5678-2 has a 2.5 V 5 ppm/°C reference, giving a full-scale output of 5 V. The on-board reference is off at power-up, allowing the use of an external reference. The internal reference is enabled via a software write. The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V and remains powered up at this level until a valid write takes place. The part...