The AD8638/AD8639 are single and dual wide bandwidth, auto-zero amplifiers featuring rail-to-rail output swing and low noise. These amplifiers have very low offset, drift, and bias current. Operation is fully specified from 5 V to 16 V single supply (±2.5 V to ±8 V dual supply).
The AD8638/AD8639 provide benefits previously found only in expensive zero-drift or chopper-stabilized amplifiers. Using the Analog Devices, Inc., topology, these auto-zero amplifiers combine low cost with high accuracy and low noise. No external capacitors are required. In addition, the AD8638/AD8639 greatly reduce the digital switching noise found in most chopper- stabilized amplifiers.
With a typical offset voltage of only 3 μV, drift of 0.01 μV/°C, and noise of 1.2 μV p-p (0.1 Hz to 10 Hz), the AD8638/AD8639 are suited for applications in which error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature ranges. Many systems can take advantage of the rail-to-rail output swing provided by the AD8638/AD8639 to maximize signal-to-noise ratio (SNR).
The AD8638/AD8639 are specified for the extended industrial temperature range (−40°C to +125°C). The single AD8638 is available in tiny 5-lead SOT-23 and 8-lead SOIC packages. The dual AD8639 is available in 8-lead MSOP, 8-lead SOIC, and 8-lead LFCSP packages.
The AD8638/AD8639 are members of a growing series of auto- zero op amps offered by Analog Devices (see Table 1 in the data sheet).
Data Sheet, Rev. C, 5/08
|Title||Content Type||File Type|
|AD8638/AD8639: 16 V Auto-Zero, Rail-to-Rail Output Operational Amplifiers Data Sheet (Rev F, 06/2010) (pdf, 632 kB)||Data Sheets|
|AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density (pdf, 182 kB)||Application Notes|
|AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (pdf, 199 kB)||Application Notes|
|Op Amp Applications Handbook||Design Handbooks||HTML|
|MT-055: Chopper Stabilized (Auto-Zero) Precision Op Amps (pdf, 320 kB)||Tutorials|
|MT-052: Op Amp Noise Figure: Don't Be Mislead (pdf, 60 kB)||Tutorials|
|MT-050: Op Amp Total Output Noise Calculations for Second-Order System (pdf, 38 kB)||Tutorials|
|MT-049: Op Amp Total Output Noise Calculations for Single-Pole System (pdf, 40 kB)||Tutorials|
|MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth (pdf, 81 kB)||Tutorials|
|MT-047: Op Amp Noise (pdf, 72 kB)||Tutorials|
WEBCAST: Noise Optimization in Sensor Signal Conditioning Circuits (Part I)
This first part of a two-part series will explore the noise topic in detail and provide tips and answers to these types of questions.
WEBCAST: Noise Optimization in Sensor Signal Conditioning Circuits (Part II)
This is the second part of a two-part series that explores the topic of signal noise in detail.
Webcast: Noise Optimization in Sensor Signal Conditioning Circuits, Part III
Expanding upon the material previously presented in "Optimizing Noise in the Sensor Signal Path" Parts I & II, this Webcast addresses some of the specific questions and areas of additional interest, raised by viewers.
|Ask the Applications Engineer - 39: Zero Drift Operational Amplifiers||Analog Dialogue||HTML|
|Demystifying Auto-Zero Amplifiers||Analog Dialogue||HTML|
Amplifiers for Signal Conditioning - Section 3
(PDF, 397 kB)
By Walt Kester, James Bryant, Walt Jung
|MS-2066: Low Noise Signal Conditioning for Sensor-Based Circuits (pdf, 425 kB)||Technical Articles|
Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000)
Demystifying Auto-Zero Amplifiers Part 1
by Eric Nolan (Analog Dialogue, March 2000)
|Zero-Drift Amplifiers (pdf, 0)||Overview|
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
An applet for demonstrating stability effects in opamp buffers.
This tool will help with the selection, evaluation and troubleshooting of voltage feedback Op-Amps. It uses typical data to model the behavior of a selected amplifier. It allows a user to select an amplifier, configure a circuit, apply a signal and evaluate the performance. It is useful for checking an amplifier's spec's such as Bandwidth, Slew Rate, Input/Output Range, Gain Error, Load Current, Stability Issues and DC Errors in a given circuit.
|ADIsim Design/Simulation Tools||HTML|
|Analog Bridge Wizard||ADIsim Design/Simulation Tools||HTML|
|AD8639 SPICE Macro Model||SPICE Models||HTML|
|Price*(100-499)||Price*1000 pcs||RoHS||View PCN/ PDN||Check Inventory/
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.