REV. B

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a

Dual 12-Bit (8-Bit Byte)

Double-Buffered CMOS D/A Converter

DAC8248

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

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

Two Matched 12-Bit DACs on One Chip

12-Bit Resolution with an 8-Bit Data Bus

Direct Interface with 8-Bit Microprocessors

Double-Buffered Digital Inputs

RESET to Zero Pin

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

5 V to

15 V Single Supply Operation

Latch-Up Resistant

Improved ESD Resistance

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

SOL Package

Available in Die Form

APPLICATIONS

Multichannel Microprocessor-Controlled Systems

Robotics/Process Control/Automation

Automatic Test Equipment

Programmable Attenuator, Power Supplies, Window

Comparators

Instrumentation Equipment

Battery Operated Equipment

GENERAL DESCRIPTION

The DAC8248 is a dual 12-bit, double-buffered, CMOS digital-

to-analog converter. It has an 8-bit wide input data port that inter-

faces directly with 8-bit microprocessors. It loads a 12-bit word in

two bytes using a single control; it can accept either a least signifi-

cant byte or most significant byte first. For designs with a 12-bit or

16-bit wide data path, choose the DAC8222 or DAC8221.

The DAC8248’s double-buffered digital inputs allow both

DAC’s analog output to be updated simultaneously. This is par-

ticularly useful in multiple DAC systems where a common

LDAC

signal updates all DACs at the same time. A single

RESET

pin resets both outputs to zero.

The DAC8248’s monolithic construction offers excellent DAC-

to-DAC matching and tracking over the full operating tempera-

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

ladder networks, two 12-bit, two 8-bit, and two 4-bit data regis-

ters, and control logic circuitry. Separate reference input and

feedback resistors are provided for each DAC. The DAC8248

(continued on page 4)

FUNCTIONAL BLOCK DIAGRAM

PIN CONNECTIONS

24-Pin 0.3" Cerdip (W Suffix),

24-Pin Epoxy DIP (P Suffix),

24-Pin SOL (S Suffix)