®
ADC574A
FPO
Microprocessor-Compatible
ANALOG-TO-DIGITAL CONVERTER
FEATURES
for freedom from latch-up and for optimum AC performance. It is complete with a self-contained +10V
reference, internal clock, digital interface for microprocessor control, and three-state outputs.
q COMPLETE 12-BIT A/D CONVERTER WITH
REFERENCE, CLOCK, AND 8-, 12-, or 16BIT MICROPROCESSOR BUS INTERFACE
The reference circuit, containing a buried zener, is lasertrimmed for minimum temperature coefficient. The
clock oscillator is current-controlled for excellent stability 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.
q IMPROVED PERFORMANCE SECOND
SOURCE FOR 574A-TYPE A/D
CONVERTERS
Conversion Time: 25µs max
Bus Access Time: 150ns max
AO Input: Bus Contention During Read
Operation Eliminated
q DUAL IN-LINE PLASTIC, PLCC AND
HERMETIC CERAMIC
q FULLY SPECIFIED FOR OPERATION ON
±12V OR ±15V SUPPLIES
q NO MISSING CODES OVER
TEMPERATURE:
0°C to +75°C: ADC574AJ and K Grades
–55°C to +125°C: ADC574ASH, TH
The converter may be externally programmed to provide 8- or 12-bit resolution. The conversion time for 12
bits is factory set for 25µs maximum.
Output data are available in a parallel format from TTLcompatible 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.
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
Control
Inputs
Control Logic
Status
Bipolar
Offset
10V Range
Reference
Input
Comparator
12-Bit D/A
Converter
Reference
Output
Three-State Buffers
Successive
Approximation
Register
Clock
20V Range
Parallel
Data
Output
10V
Reference
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1984 Burr-Brown Corporation
PDS-550G
Printed in U.S.A., August, 1993
