AD549
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AD549

Ultralow Input-Bias Current Operational Amplifier

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SPICE Model AD549 SPICE Macro Model Download 3.59 KB LTspice AD549 - Operational Amplifiers (Op Amps) Download 1.3 KB
Part Models 5
1ku List Price Starting From $34.24
Features
  • Ultralow input bias current
    • 60 fA maximum (AD549L)
    • 100 fA maximum (AD549K)
    • 250 fA maximum (AD549J)
  • Input bias current guaranteed over the common-mode voltage range
  • Low offset voltage
    • 0.50 mV maximum (AD549K)
    • 1.00 mV maximum (AD549J)
  • Low offset drift
    • 15 µV/°C maximum (AD549K)
    • 20 µV/°C maximum (AD549J)
  • Low power
    • 700 µA maximum supply current
  • Low input voltage noise
    • 4 µV (typ) p-p over 0.1 Hz to 10 Hz
  • MIL-STD-883B parts available
Additional Details
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The AD549 is a monolithic electrometer operational amplifier with very low input bias current. Input offset voltage and input offset voltage drift are laser trimmed for precision performance. The ultralow input current of the part is achieved with Topgate™ JFET technology, a process development exclusive to Analog Devices, Inc. This technology allows fabrication of extremely low input current JFETs compatible with a standard junction isolated bipolar process. The 1015 Ω common-mode impedance, which results from the bootstrapped input stage, ensures that the input current is essentially independent of the common-mode voltage.

The AD549 is suited for applications that require very low input current and low input offset voltage. It excels as a preamp for a wide variety of current output transducers, such as photo-diodes, photomultiplier tubes, or oxygen sensors. The AD549 can also be used as a precision integrator or low droop sample and hold. The AD549 is pin compatible with standard FET and electrometer op amps, allowing designers to upgrade the performance of present systems at little additional cost.

The AD549 is available in a TO-99 hermetic package. The case is connected to Pin 8 so that the metal case can be independently connected to a point at the same potential as the input terminals, minimizing stray leakage to the case. The AD549 is available in four performance grades. The J, K, and L versions are rated over the commercial temperature range of 0°C to +70°C. The S grade is specified over the military temperature range of −55°C to +125°C and is available processed to MIL-STD-883B, Rev. C. Extended reliability plus screening is also available. Plus screening includes 168 hour burn-in, as well as other environmental and physical tests derived from MIL-STD-883B, Rev. C.

Product Highlights

  1. The AD549 input currents are specified, 100% tested, and guaranteed after the device is warmed up. They are guaranteed over the entire common-mode input voltage range.
  2. The AD549 input offset voltage and drift are laser trimmed to 0.50 mV and 15 μV/°C (AD549K), and to 1 mV and 20 μV/°C (AD549J)..
  3. A maximum quiescent supply current of 700 μA minimizes heating effects on input current and offset voltage.
  4. AC specifications include 1 MHz unity gain bandwidth and 3 V/μs slew rate. Settling time for a 10 V input step is 5 μs to 0.01%.

Applications

  • Electrometer amplifier
  • Photodiode preamp
  • pH electrode buffer
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file View Data Sheet (Rev.K)
Documentation View All Documentation
SPICE Model AD549 SPICE Macro Model Download 3.59 KB LTspice AD549 - Operational Amplifiers (Op Amps) Download 1.3 KB
Part Models 5
1ku List Price Starting From $34.24
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AD549

Documentation

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Data Sheet

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UPDATED 07/02/2008
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AD549: Ultralow Input-Bias Current Operational Amplifier Data Sheet (Rev.K)

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Application Note

6

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UPDATED 02/14/2015
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AN-253: Find Op Amp Noise with Spreadsheet redirect icon

77 kB

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UPDATED 02/14/2015
English
AN-356: User's Guide to Applying and Measuring Operational Amplifier Specifications redirect icon

538 kB

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UPDATED 05/21/2010
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AN-356: 用户指南：运算放大器规格参数的应用和测量 (Rev.0) redirect icon

538 kB

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UPDATED 03/29/2010
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AN-356: オペアンプの仕様を適用・測定するためのユーザーズ・ガイド redirect icon

623 kB

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UPDATED 02/14/2015
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AN-357: Operational Integrators redirect icon

272 kB

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UPDATED 12/06/2002
Japanese
AN-357: オペアンプを使った積分器 redirect icon

442 kB

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Technical Articles

4

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UPDATED 01/06/2014
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TNJ-007：OPアンプの電流性・電圧性ノイズの良し悪しと回路のカスケード接続 redirect icon

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UPDATED 08/01/2014
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Optimizing Precision Photodiode Sensor Circuit Design redirect icon

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UPDATED 08/01/2014
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精密光电二极管传感器电路优化设计 redirect icon

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UPDATED 08/01/2014
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高精度フォトダイオード・センサー回路設計の最適化 redirect icon

Frequently Asked Question

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UPDATED 12/07/2014
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Documentation

Technical Documents 6
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD549-CHIPS-WP CHIPS OR DIE
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  • Material Declaration external-link
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  • Reliablity Data external-link
AD549JHZ 8-Pin TO-99 external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
AD549KHZ 8-Pin TO-99 external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
AD549LHZ 8-Pin TO-99 external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
AD549SH/883B 8-Pin TO-99 external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Product Lifecycle

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Dec 12, 2023

- 23_0197

Die Attach Adheshive Paste Raw Material Change

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN23_0197_Form

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xls

Material_Report

Download

pdf

Qualification Results Summary

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Apr 10, 2013

- 13_0068

AD549 ESD Improvement

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN13_0068_Form

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xls

Material_Report

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Qualification Report Summary

Nov 9, 2011

- 11_0050

Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN11_0050_Form

external-icon

xls

Material_Report

Download

Nov 9, 2011

- 11_0182

Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN11_0182_Form

external-icon

xls

Material_Report

Download

Aug 19, 2014

- 14_0141

AD549 K Grade Datasheet Revision

AD549KHZ

pdf

PCN14_0141_Form

external-icon

xls

Material_Report

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Apr 9, 2018

- 16_0026

Qualify TeamQuest Technology, Inc. for Burn-in and Life Test of Military and Aerospace Devices

AD549SH/883B

pdf

PCN16_0026_Form

external-icon

xls

Material_Report

Download

Qualification Results Summary

Jun 6, 2012

- 12_0066

Add capacity for Burn In of Hermetic, 883 & QMLQ/Class B devices at TSSI Cavite

AD549SH/883B

pdf

PCN12_0066_Form

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xls

Material_Report

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pdf

Qualification Report Summary

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Part Models

Product Lifecycle

PCN

Dec 12, 2023

- 23_0197

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Die Attach Adheshive Paste Raw Material Change

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN23_0197_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon
Apr 10, 2013

- 13_0068

arrow down

AD549 ESD Improvement

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN13_0068_Form

external-icon

xls

Material_Report

Download
Qualification Report Summary
Nov 9, 2011

- 11_0050

arrow down

Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN11_0050_Form

external-icon

xls

Material_Report

Download
Nov 9, 2011

- 11_0182

arrow down

Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines

AD549JHZ

AD549KHZ

AD549LHZ

AD549SH/883B

pdf

PCN11_0182_Form

external-icon

xls

Material_Report

Download
Aug 19, 2014

- 14_0141

arrow down

AD549 K Grade Datasheet Revision

AD549KHZ

pdf

PCN14_0141_Form

external-icon

xls

Material_Report

Download
Apr 9, 2018

- 16_0026

arrow down

Qualify TeamQuest Technology, Inc. for Burn-in and Life Test of Military and Aerospace Devices

AD549SH/883B

pdf

PCN16_0026_Form

external-icon

xls

Material_Report

Download
Qualification Results Summary
Jun 6, 2012

- 12_0066

arrow down

Add capacity for Burn In of Hermetic, 883 & QMLQ/Class B devices at TSSI Cavite

AD549SH/883B

pdf

PCN12_0066_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Report Summary

external-icon

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Tools & Simulations 4

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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AD549 - Operational Amplifiers (Op Amps) Download

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