Zero-Drift Amplifiers - Analog Devices - #1

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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