© 1991 Burr-Brown Corporation

PDS-1109F

Printed in U.S.A. July, 1995

ADS774

FEATURES

q REPLACES ADC574, ADC674 AND ADC774

FOR NEW DESIGNS

q COMPLETE SAMPLING A/D WITH

REFERENCE, CLOCK AND

MICROPROCESSOR INTERFACE

q FAST ACQUISITION AND CONVERSION:

8.5

q ELIMINATES EXTERNAL SAMPLE/HOLD

IN MOST APPLICATIONS

q GUARANTEED AC AND DC PERFOR-

MANCE

q SINGLE +5V SUPPLY OPERATION

q LOW POWER: 120mW max

q PACKAGE OPTIONS: 0.6" and 0.3" DIPs,

SOIC

Microprocessor-Compatible Sampling

CMOS ANALOG-to-DIGITAL CONVERTER

Comparator

2.5V Reference

Input

CDAC

10V Range

20V Range

Bipolar Offset

–

+

2.5V Reference

Output

Control

Inputs

2.5V

Reference

Clock

Successive

Approximation

Register

Control Logic

Status

Parallel

Data

Output

®

DESCRIPTION

The ADS774 is a 12-bit successive approximation

analog-to-digital converter using an innovative

capacitor array (CDAC) implemented in low-power

CMOS technology. This is a drop-in replacement for

ADC574, ADC674, and ADC774 models in most

applications, with internal sampling, much lower power

consumption, and the ability to operate from a single

+5V supply.

The ADS774 is complete with internal clock, micro-

processor interface, three-state outputs, and internal

scaling resistors for input ranges of 0V to +10V, 0V to

+20V,

±5V, or ±10V. The maximum throughput time

is 8.5

µs over the full operating temperature range,

including both acquisition and conversion.

Complete user control over the internal sampling func-

tion facilitates elimination of external sample/hold

amplifiers in most existing designs.

The ADS774 requires +5V, with –15V optional. No

+15V supply is required. Available packages include

0.3" or 0.6" wide 28-pin plastic DIP and 28-pin SOICs.

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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

ADS774

ADS774

ADS774

SBAS010