Zero-Drift Amplifiers0 pages
Why Use Zero-Drift Amplifiers?
Initial offset voltage can be removed with a routine calibration. But offset voltage does not
stay constant; it will change over time and temperature. A zero-drift amplifier is ideal for
applications with high gain that need very low offset voltage and drift. They are used in the
same way as other op amps.
Applications
• Temperature sensors
• Thermopiles/thermocouples
• Pressure sensors
• Precision current sensing
• Strain gage amplifiers
• Medical instrumentation
• Precision references
• Automotive sensors
• Electronic weigh scales
• Photodiode amplifiers
ZERO-DRIFT AMPLIFIER OVERVIEW
• ELIMINATES OFFSET VOLTAGE
CHANGE OVER TIME
• ELIMINATES OFFSET VOLTAGE
CHANGE OVER TEMPERATURE
• REDUCES 1/f (LOW FREQUENCY)
NOISE
• SEE AD8552 AND ADA4051 DATA
SHEETS OR MT-055 TUTORIAL AT
WWW.ANALOG.COM FOR
COMPLETE THEORY
FREQUENCY (kHz)
VOLTAGE NOISE DENSITY (nV/Hz)
120
105
90
75
60
45
30
15
0
0 2 4 6 8 10
COMPETITOR A
COMPETITOR B
ANALOG DEVICES
Zero-Drift Amplifiers
• Self-correcting, even over temperature
and time
• VOS = 5....V max @ 25·C
• TCVOS = 0.005....V/·C up to 125·C
Best-in-Class for Precision
www.analog.com/amps