®
ADS574
Microprocessor-Compatible Sampling
CMOS ANALOG-to-DIGITAL CONVERTER
FEATURES
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COMPATIBLE WITH ADC574
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COMPLETE SAMPLING A/D WITH
REFERENCE, CLOCK AND
MICROPROCESSOR INTERFACE
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FAST ACQUISITION AND CONVERSION:
25
µ
s max
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ELIMINATES EXTERNAL SAMPLE/HOLD
IN MOST APPLICATIONS
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GUARANTEED AC AND DC PERFORMANCE
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SINGLE +5V SUPPLY OPERATION
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LOW POWER: 100mW max
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PACKAGE OPTIONS: 0.6" and 0.3" DIPs,
SOIC
DESCRIPTION
The ADS574 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 models in most applications, with internal
sampling, much lower power consumption, and capa-
bility to operate from a single +5V supply.
The ADS574 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
for 12-bit conversions is 25µs over the full operating
temperature range, including both acquisition and con-
version.
Complete user control over the internal sampling func-
tion facilitates elimination of external sample/hold
amplifiers in most existing designs.
The ADS574 is available in both commercial (0°C to
+70°C) and military (–55°C to +125°C) ranges, and
requires +5V, with –12V or –15V optional, depending
on usage. No +15V supply is required. Available
packages include 0.3" or 0.6" wide 28-pin plastic or
hermetic ceramic DIPs, and 28-pin SOICs.
Status
Control
Inputs
Bipolar Offset
20V Range
10V Range
2.5V Reference
Input
2.5V Reference
Output
Control Logic
Three-State Buffers
CDAC
–
+
Clock
Successive
Approximation
Register
Parallel
Data
Output
Comparator
2.5V
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
© 1991 Burr-Brown Corporation
PDS-1104D
Printed in U.S.A. July, 1993
BURR-BROWN [ BURR-BROWN CORPORATION ]
