REV. C

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a

Quad 8-Bit Voltage Out CMOS DAC

Complete with Internal 10 V Reference

DAC8426

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

Tel: 617/329-4700

Fax: 617/326-8703

GENERAL DESCRIPTION

The DAC8426 is a complete quad voltage output D/A converter

with internal reference. This product fits directly into any exist-

ing 7226 socket where the user currently has a 10 V external

reference. The external reference is no longer necessary. The

internal reference of the DAC8426 is laser-trimmed to

±0.4%

FEATURES

No Adjustments Required, Total Error

1 LSB Max

Over Temperature

Four Voltage-Output DACs on a Single Chip

Internal 10 V Bandgap Reference

Operates from Single

15 V Supply

Fast 50 ns Data Load Time, All Temperatures

Pin-for-Pin Replacement for PM-7226 and AD7226,

Eliminates External Reference

APPLICATIONS

Process Controls

Multichannel Microprocessor Controlled:

System Calibration

Op Amp Offset and Gain Adjust

Level and Threshold Setting

offering a 25 ppm/

°C temperature coefficient and 5 mA of exter-

nal load driving capability.

The DAC8426 contains four 8-bit voltage-output CMOS D/A

converters on a single chip. A 10 V output bandgap reference

sets the output full-scale voltage. The circuit also includes four

input latches and interface control logic.

One of the four latches, selected by the address inputs, is loaded

from the 8-bit data bus input when the write strobe is active

low. All digital inputs are TTL/CMOS (5 V) compatible. The

on-board amplifiers can drive up to 10 mA from either a single

or dual supply. The on-board reference that is always connected

to the internal DACs has 5 mA available to drive external devices.

Its compact size, low power, and economical cost-per-channel,

make the DAC8426 attractive for applications requiring mul-

tiple D/A converters without sacrificing circuit-board space. Sys-

tem reliability is also increased due to reduced parts count.

PMI’s advanced oxide-based, silicon-gate, CMOS process al-

lows the DAC8426’s analog and digital circuitry to be manufac-

tured on the same chip. This, coupled with PMI’s highly stable

thin-film R-2R resistor ladder, aids in matching and tempera-

ture tracking between DACs.

FUNCTIONAL BLOCK DIAGRAM