REV. C

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a

Dual 12-Bit Double-Buffered

Multiplying CMOS D/A Converter

DAC8222

FEATURES

Two Matched 12-Bit DACs on One Chip

Direct Parallel Load of All 12 Bits for High Data

Throughput

Double-Buffered Digital Inputs

12-Bit Endpoint Linearity ( 1/2 LSB) Over Temperature

+5 V to +15 V Single Supply Operation

DACs Matched to 1% Max

Four-Quadrant Multiplication

Improved ESD Resistance

Packaged in a Narrow 0.3" 24-Lead DIP and 0.3"

24- Lead SOL Package

Available in Die Form

APPLICATIONS

Automatic Test Equipment

Robotics/Process Control/Automation

Digital Gain/Attenuation Control

Ideal for Battery-Operated Equipment

GENERAL DESCRIPTION

The DAC8222 is a dual 12-bit, double-buffered, CMOS digital-

to-analog converter. It has a 12-bit wide data port that allows a

12-bit word to be loaded directly. This achieves faster through-

put time in stand-alone systems or when interfacing to a 16-bit

processor. A common 12-bit input TTL/CMOS compatible

data port is used to load the 12-bit word into either of the two

DACs. This port, whose data loading is similar to that of a RAM’s

write cycle, interfaces directly with most 12-bit and 16-bit bus

systems. (See DAC8248 for a complete 8-bit data bus interface

product.) A common bus allows the DAC8222 to be packaged

in a narrow 24-lead 0.3" DIP and save PCB space.

The DAC is controlled with two signals,

WR and LDAC. With

logic low at these inputs, the DAC registers become transparent.

This allows direct unbuffered data to flow directly to either

DAC output selected by

DAC A/DAC B. Also, the DAC’s

FUNCTIONAL DIAGRAM

double-buffered digital inputs will allow both DACs to be

simultaneously updated.

DAC8222’s monolithic construction offers excellent DAC-to-

DAC matching and tracking over the full operating tempera-

ture range. The chip consists of two thin-film R-2R resistor

ladder networks, four 12-bit registers, and DAC control logic

circuitry. The device has separate reference-input and feedback

resistors for each DAC and operates on a single supply from

+5 V to +15 V. Maximum power dissipation at +5 V using

The DAC8222 is manufactured with highly stable thin-film re-

sistors on an advanced oxide-isolated, silicon-gate, CMOS

technology. Improved latch-up resistant design eliminates the

need for external protective Schottky diodes.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000