1

®

DAC1220

®

20-Bit Low Power

DIGITAL-TO-ANALOG CONVERTER

FEATURES

q 20-BIT MONOTONICITY GUARANTEED

OVER –40

q LOW POWER: 2.5mW

q VOLTAGE OUTPUT

q SETTLING TIME: 2ms to 0.012%

q MAX LINEARITY ERROR:

q ON-CHIP CALIBRATION

APPLICATIONS

q PROCESS CONTROL

q ATE PIN ELECTRONICS

q CLOSED-LOOP SERVO-CONTROL

q SMART TRANSMITTERS

q PORTABLE INSTRUMENTS

DESCRIPTION

The DAC1220 is a 20-bit digital-to-analog (D/A)

converter offering 20-bit monotonic performance over

the specified temperature range. It utilizes delta-sigma

technology to achieve inherently linear performance

in a small package at very-low power. The resolution

of the device can be programmed to 20 bits for full-

scale, settling to 0.003% within 15ms typical, or 16

bits for full-scale, settling to 0.012% within 2ms max.

The output range is two times the external reference

voltage. On-chip calibration circuitry dramatically re-

duces low offset and gain errors.

The DAC1220 features a synchronous serial interface.

In single-converter applications, the serial interface

can be accomplished with just two wires, allowing

low-cost isolation. For multiple converters, a CS signal

allows for selection of the appropriate D/A converter.

The DAC1220 has been designed for closed-loop

control applications in the industrial process control

market and high-resolution applications in the test and

measurement market. It is also ideal for remote appli-

cations, battery-powered instruments, and isolated sys-

tems. The DAC1220 is available in a SSOP-16

package.

© 1998 Burr-Brown Corporation

PDS-1418B

Printed in U.S.A. April , 2000

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

Clock Generator

Serial

Interface

Second-Order

∆∑

Modulator

Instruction Register

Command Register

Data Register

Offset Register

Full-Scale Register

Microcontroller

First-Order

Switched

Capacitor Filter

Second-Order

Continuous

Time Post Filter

Modulator Control

AV

DD

AGND

X

IN

X

OUT

V

REF

CS

DV

DD

DGND

C

1

C

2

SDIO

V

OUT

SCLK

DAC1220

For most current data sheet and other product

information, visit www.burr-brown.com