AD549
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AD549

Ultralow Input-Bias Current Operational Amplifier

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Info: : PRODUCTION tooltip
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Part Details
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
Part Models 5
1ku List Price Starting From $34.24

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD549-CHIPS-WP
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AD549JHZ
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AD549KHZ
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AD549LHZ
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AD549SH/883B
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Product Lifecycle

PCN

Dec 12, 2023

- 23_0197

Die Attach Adheshive Paste Raw Material Change

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Apr 10, 2013

- 13_0068

AD549 ESD Improvement

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Nov 9, 2011

- 11_0050

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

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Nov 9, 2011

- 11_0182

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

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Aug 19, 2014

- 14_0141

AD549 K Grade Datasheet Revision

Apr 9, 2018

- 16_0026

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

Jun 6, 2012

- 12_0066

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

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Dec 12, 2023

- 23_0197

arrow down

Die Attach Adheshive Paste Raw Material Change

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Apr 10, 2013

- 13_0068

arrow down

AD549 ESD Improvement

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Nov 9, 2011

- 11_0050

arrow down

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

AD549JHZ

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

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

PRODUCTION

AD549KHZ

PRODUCTION

AD549LHZ

PRODUCTION

AD549SH/883B

PRODUCTION

Aug 19, 2014

- 14_0141

arrow down

AD549 K Grade Datasheet Revision

Apr 9, 2018

- 16_0026

arrow down

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

Jun 6, 2012

- 12_0066

arrow down

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

Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

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.

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