®

ADC574A

FPO

Microprocessor-Compatible

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q COMPLETE 12-BIT A/D CONVERTER WITH

REFERENCE, CLOCK, AND 8-, 12-, or 16-

BIT MICROPROCESSOR BUS INTERFACE

q IMPROVED PERFORMANCE SECOND

SOURCE FOR 574A-TYPE A/D

CONVERTERS

Conversion Time: 25

Bus Access Time: 150ns max

Operation Eliminated

q DUAL IN-LINE PLASTIC, PLCC AND

HERMETIC CERAMIC

q FULLY SPECIFIED FOR OPERATION ON

q NO MISSING CODES OVER

TEMPERATURE:

0

–55

DESCRIPTION

The ADC574A is a 12-bit successive approximation

analog-to-digital converter, utilizing state-of-the-art

CMOS and laser-trimmed bipolar die custom-designed

for freedom from latch-up and for optimum AC per-

formance. It is complete with a self-contained +10V

reference, internal clock, digital interface for micropro-

cessor control, and three-state outputs.

The reference circuit, containing a buried zener, is laser-

trimmed for minimum temperature coefficient. The

clock oscillator is current-controlled for excellent sta-

bility over temperature. Full-scale and offset errors may

be externally trimmed to zero. Internal scaling resistors

are provided for the selection of analog input signal

ranges of 0V to +10V, 0V to +20V,

±5V, and ±10V.

The converter may be externally programmed to pro-

vide 8- or 12-bit resolution. The conversion time for 12

bits is factory set for 25

µs maximum.

Output data are available in a parallel format from TTL-

compatible three-state output buffers. Output data are

coded in straight binary for unipolar input signals and

bipolar offset binary for bipolar input signals.

The ADC574A, available in both industrial and military

temperature ranges, requires supply voltages of +5V

and

±12V or ±15V. It is packaged in a 28-pin plastic

DIP, and a hermetic side-brazed ceramic DIP.

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

•

Cable: BBRCORP

•

Telex: 066-6491

•

FAX: (520) 889-1510

•

Immediate Product Info: (800) 548-6132

Control Logic

Comparator

12-Bit D/A

Converter

10V

Control

Inputs

Bipolar

Offset

20V Range

10V Range

Reference

Input

Reference

Output

Status

Parallel

Data

Output

Clock

Reference

© 1984 Burr-Brown Corporation

PDS-550G

Printed in U.S.A., August, 1993