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AD8628:  Zero-Drift, Single-Supply, RRIO Op Amp

Product Details


Newer Alternatives:
  • ADA4528-1 low noise, zero-drift, Auto-Zero Op Amp

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is fully specified from 2.7 V to 5 V single supply (±1.35 V to ±2.5 V dual supply).

The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/ AD8629/AD8630 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.

With an offset voltage of only 1 μV, drift of less than 0.005 μV/°C, and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8628/ AD8629/AD8630 are suited for applications where 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 range. Many systems can take advantage of the rail-to-rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR.

The AD8628/AD8629/AD8630 are specified for the extended industrial temperature range (−40°C to +125°C). The AD8628 is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead narrow SOIC plastic packages. The AD8629 is available in the standard 8-lead narrow SOIC and MSOP plastic packages. The AD8630 quad amplifier is available in 14-lead narrow SOIC and 14-lead TSSOP plastic packages. See the Ordering Guide for automotive grades.

Applications
  • Automotive sensors
  • Pressure and position sensors
  • Strain gage amplifiers
  • Medical instrumentation
  • Thermocouple amplifiers
  • Precision current sensing
  • Photodiode amplifiers

FEATURES and BENEFITS

  • Chinese data sheet available
  • Lowest auto-zero amplifier noise
  • Low offset voltage: 1 μV
  • Input offset drift: 0.002 μV/°C
  • Rail-to-rail input and output swing
  • 5 V single-supply operation
  • High gain, CMRR, and PSRR: 130 dB
  • Very low input bias current: 100 pA maximum
  • Low supply current: 1.0 mA
  • Overload recovery time: 50 μs
  • No external components required
  • Qualified for automotive applications

Pin Diagrams

Similar Products

  • AD8638 and AD8639: fully specified from 5 V to 16 V single supply (±2.5 V to ±8 V dual supply)
  • ADA4528-1 and ADA4528-2: available in single and dual versions offering lower offset and voltage noise, with higher bandwidth in a zero-drift precision Op Amp

Documentation

Title Content Type File Type
AD8628/AD8629/AD8630: Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier Data Sheet (Rev K, 08/2014) (pdf, 414 kB) Data Sheets PDF
AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density  (pdf, 182 kB) Application Notes PDF
AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance  (pdf, 199 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-106: A Collection of Amp Applications  (pdf, 1094 kB)
Examines Some of the Numerous and Widely Used Applications of the Operational Amplifier
Application Notes PDF
CN0281: Automotive SENT Interface-Based Thermocouple Temperature Sensor with Cold Junction Compensation Using the ADuC7060/ADuC7061 Precision Analog Microcontroller  (pdf, 288 kB) Circuit Note PDF
CN-0079: High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/AD5541 Voltage Output DAC, ADR421 Reference, and AD8628 Auto-Zero Op Amp  (pdf) Circuit Note PDF
CN-0061: DC-Coupled, Single-Ended-to-Differential Conversion Using the AD8138 Low Distortion Differential ADC Driver and AD7357 Dual, 4.2 MSPS, 14-Bit SAR ADC  (pdf, 96 kB) Circuit Note PDF
CN-0027: Precision, Unipolar, Noninverting Configuration for the AD5547/AD5557 DAC  (pdf, 90 kB) Circuit Note PDF
CN-0026: Precision, Unipolar, Inverting Conversion Using the AD5547/AD5557 DAC  (pdf, 90 kB) Circuit Note PDF
CN-0023: Precision, Unipolar, Noninverting Configuration for the AD5546/AD5556 DAC  (pdf, 92 kB) Circuit Note PDF
CN-0022: Precision, Unipolar, Inverting Conversion Using the AD5546/AD5556 DAC  (pdf, 91 kB) Circuit Note PDF
Op Amp Applications Handbook Design Handbooks HTML
MT-055: Chopper Stabilized (Auto-Zero) Precision Op Amps  (pdf, 320 kB) Tutorials PDF
MT-052: Op Amp Noise Figure: Don't Be Misled  (pdf, 60 kB) Tutorials PDF
MT-050: Op Amp Total Output Noise Calculations for Second-Order System  (pdf, 38 kB) Tutorials PDF
MT-049: Op Amp Total Output Noise Calculations for Single-Pole System  (pdf, 40 kB) Tutorials PDF
MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth  (pdf, 81 kB) Tutorials PDF
MT-047: Op Amp Noise  (pdf, 72 kB) Tutorials PDF
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.
Webcasts WEBCAST
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.
Webcasts WEBCAST
Ask the Applications Engineer - 39: Zero Drift Operational Amplifiers Analog Dialogue HTML
Demystifying Auto-Zero Amplifiers Analog Dialogue HTML
MS-2062: To Chop or Auto-Zero: That Is the Question.  (pdf, 278 kB) Technical Articles PDF
Amplifiers for Signal Conditioning - Section 3  (PDF, 397 kB)
By Walt Kester, James Bryant, Walt Jung
Technical Articles PDF
MS-2066: Low Noise Signal Conditioning for Sensor-Based Circuits  (pdf, 425 kB) Technical Articles PDF
Demystifying Auto-Zero Amplifiers Part 2
by Eric Nolan and Reza Moghimi (Analog Dialogue, May 2000)
Technical Articles HTML
Demystifying Auto-Zero Amplifiers Part 1
by Eric Nolan (Analog Dialogue, March 2000)
Technical Articles HTML
Difference Amplifier Uses Digital Potentiometers
by Reza Moghimi, Analog Devices, Inc.
(EDN, May 30, 2002)
Technical Articles HTML
Zero-Drift Amplifiers  (pdf, 0) Overview PDF
ICs for Programmable Logic Control and Distributed Control Systems  (pdf, 976 kB)
Analog Devices leadership in industrial IC technology, with the development of the iCMOS™ and iPolar™ processes, has uniquely defined high voltage and low voltage integration to deliver smaller, higher performance, and more cost effective ICs for industrial systems.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
OpAmp Stability
An applet for demonstrating stability effects in opamp buffers.
Design Calculators HTML
ADIsimOpAmp™
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
The Analog Bridge Wizard recommends amplifiers and ADC's for your bridge application. Find out which op-amp or in-amp is best for your design, and view the error budget analysis for that solution.
ADIsim Design/Simulation Tools HTML
AD8628 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD8628 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8628ARTZ-R2 Status: Production 5 ld SOT-23 5 Ind Reel, 250 $1.54 $1.54 Y  Material Info PCN Purchase
AD8628ARTZ-REEL7 Status: Production 5 ld SOT-23 5 Ind Reel, 3000 - $0.96 Y  Material Info PCN Purchase Sample
AD8628ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $1.11 $0.96 Y  Material Info PCN Purchase Sample
AD8628ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $0.96 Y  Material Info PCN Purchase
AD8628ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $0.96 Y  Material Info PCN Purchase
AD8628AUJZ-R2 Status: Production 5 ld TSOT 5 Ind Reel, 250 $1.69 $1.69 Y  Material Info PCN Purchase
AD8628AUJZ-REEL Status: Production 5 ld TSOT 5 Ind Reel, 10000 - $0.96 Y  Material Info PCN Purchase
AD8628AUJZ-REEL7 Status: Production 5 ld TSOT 5 Ind Reel, 3000 - $0.96 Y  Material Info PCN Purchase Sample
AD8628WARTZ-R7 Status: Production 5 ld SOT-23 5 Auto Reel, 3000 - $1.20 Y  Material Info PCN Purchase Sample
AD8628WARTZ-RL Status: Production 5 ld SOT-23 5 Auto Reel, 10000 - $1.20 Y  Material Info PCN Purchase
AD8628WARZ-R7 Status: Production 8 ld SOIC 8 Auto Reel, 1000 - $1.20 Y  Material Info PCN Purchase Sample
AD8628WARZ-RL Status: Production 8 ld SOIC 8 Auto Reel, 2500 - $1.20 Y  Material Info PCN Purchase
AD8628WAUJZ-R7 Status: Production 5 ld TSOT 5 Auto Reel, 3000 - $1.20 Y  Material Info Notify Me Purchase Sample
AD8628WAUJZ-RL Status: Production 5 ld TSOT 5 Auto Reel, 10000 - $1.20 Y  Material Info PCN Purchase
Price Table Help

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.

EVAL-OPAMP-1 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-PRAOPAMP-1KSZ Status: Production Single KS-5 lead SC70 Evaluation Board $20.19 Yes -
EVAL-PRAOPAMP-1RJZ Status: Production Single RJ-5 lead SOT23 Evaluation Board $20.19 Yes -
EVAL-PRAOPAMP-1RMZ Status: Production Single RM-8 lead MSOP Evaluation Board $20.19 Yes -
EVAL-PRAOPAMP-1RZ Status: Production Single R-8 lead SOIC Evaluation Board $20.19 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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