Technical Article
MS-2212
Summary
RESOURCES
Rail-to-rail output op amps have unique characteristics
when operated as comparators.
For resources and information on op amps,
visit www.analog.com/opamps.
The best solutions to improving battery life and increasing
performance are to use a low cost comparator when a
comparator function is required, tying off any used op amp
sections as followers with the noninverting input connected
to a stable voltage within the input voltage range of the op
amp, or using singles and duals as appropriate instead of
quads. Supply current may greatly exceed the “Max” stated
on the data sheet. Under carefully considered conditions,
unused op amps can be used as comparators, but using the
proper mix of op amps and comparators will result in lower
supply current and well-defined performance.
Products Mentioned in This Article
Product
Description
Single-Supply Rail-to-Rail Input/Output
Operational Amplifier
OP184
Dual Precision Rail-to-Rail Input/Output
Operational Amplifier
OP284
Precision, Low Noise, CMOS, Rail-to-Rail
Input/Output Operational Amplifier
AD8605
ADA4092-4
AD8657
Micropower, OVP, Rail-to-Rail Input/Output
Operational Amplifier
Precision, Micropower 18 V CMOS Rail-to-Rail
Input/Output Operational Amplifier
REFERENCES
ABOUT THE AUTHOR
±. Kester, Walt “Op Amp Inputs, Outputs, Single-Supply,
and Rail-to-Rail Issues” MT-035 Tutorial
www.analog.com/MT-035
Harry Holt is a staff applications engineer at Analog Devices
(San Jose, CA) in the Precision Amplifiers Group where he
has worked for four years, following 27 years in both field
and factory applications at National Semiconductor for a
variety of products, including data converters, op amps,
references, audio codecs, and FPGAs. He has a BSEE from
San Jose State University and is a life member of Tau Beta Pi
and a Senior Member of the IEEE.
2. Frost, Robert “Mountain Interval” New York: Henry
Holt & Company, ±920.
3. ”Comparators” MT-083 Tutorial
www.analog.com/MT-083
4. Sylvan, John, “High-speed comparators provide many
useful circuit functions when used correctly” Analog
Dialogue, Ask the Applications Engineer— 5
www.analog.com/analogdialogue
5. Bryant, James “Using Op Amps as Comparators” 2006
AN-849 at www.analog.com/AN-849
6. Kester, Walt “Using Op Amps As Comparators”
MT-084 Tutorial www.analog.com/MT-084
7. Moghimi, Reza “Amplifiers as Comparators?” Analog
Dialogue Ask the Applications Engineer—3±
www.analog.com/analogdialogue
8. Holt, Harry ”OP Amps: To Dual or Not to Dual”
www.eetimes.com
9. ADA4092-4 data sheet www.analog.com/ADA4092-4
±0. AD8657 data sheet www.analog.com/AD8657
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Trademarks and registered trademarks are the property of their
respective owne TA10133-0-11/11(0)
• Fax: 781.461.3113 • www.analog.com
www.analog.com
©2011 Analog Devices, Inc. All rights reserved.
November 2011 | Page 5 of 5
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