© 1991 Burr-Brown Corporation PDS-1109F Printed in U.S.A. July, 1995
ADS774
FEATURES
● REPLACES ADC574, ADC674 AND ADC774
FOR NEW DESIGNS
● COMPLETE SAMPLING A/D WITH
REFERENCE, CLOCK AND
MICROPROCESSOR INTERFACE
● FAST ACQUISITION AND CONVERSION:
8.5
µs max OVER TEMPERATURE
● ELIMINATES EXTERNAL SAMPLE/HOLD
IN MOST APPLICATIONS
● GUARANTEED AC AND DC PERFOR-
MANCE
● SINGLE +5V SUPPLY OPERATION
● LOW POWER: 120mW max
● 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
Three-State Buffers
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 8.5µs 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
