ADA4530-1
Info : RECOMMENDED FOR NEW DESIGNS
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ADA4530-1

Femtoampere Input Bias Current Electrometer Amplifier

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 3
1ku List Price Starting From $13.42
Features
  • Low input bias current
    • ±20 fA maximum at TA = 25°C (guaranteed at production test)
    • ±20 fA maximum at −40°C < TA < +85°C
    • ±250 fA maximum at −40°C < TA < +125°C (guaranteed at production test)
  • Low offset voltage: 50 μV maximum over specified CMRR range
  • Offset voltage drift: ±0.13 μV/°C typical, ±0.5 μV/°C maximum
  • Integrated guard buffer with 100 μV maximum offset
  • Low voltage noise density: 14 nV/√Hz at 10 kHz
  • Wide bandwidth: 2 MHz unity-gain crossover
  • Supply voltage: 4.5 V to 16 V (±2.25 V to ±8 V)
  • Operating temperature: −40°C to +125°C
  • Long-term offset voltage drift (10,000 hours): 0.5 μV typical
  • Temperature hysteresis: 1.5 μV typical
Additional Details
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The ADA4530-1 is a femtoampere (10−15 A) level input bias current operational amplifier suitable for use as an electrometer that also includes an integrated guard buffer. It has an operating voltage range of 4.5 V to 16 V, enabling it to operate in conventional 5 V and 10 V single supply systems as well as ±2.5 V and ±5 V dual supply systems.

It provides ultralow input bias currents that are production tested at 25°C and at 125°C to ensure the device meets its performance goals in user systems. The integrated guard buffer isolates the input pins from leakage in the printed circuit board (PCB), minimizes board component count, and enables easy system design. The ADA4530-1 is available in an industry-standard surface-mount 8-lead SOIC package with a unique pinout optimized to prevent signals from coupling between the sensitive input pins, the power supplies, and the output pin while enabling easy routing of the guard ring traces.

The ADA4530-1 also offers low offset voltage, low offset drift, and low voltage and current noise needed for the types of applications that require such low leakages.

To maximize the dynamic range of the system, the ADA4530-1 has a rail-to-rail output stage that can typically drive to within 30 mV of the supply rails under a 10 kΩ load.

The ADA4530-1 operates over the −40°C to +125°C industrial temperature range and is available in an 8-lead SOIC package.

Applications

  • Laboratory and analytical instrumentation: spectrophotometers, chromatographs, mass spectrometers, and potentiostatic and amperostatic coulometry
  • Instrumentation: picoammeters and coulombmeters
  • Transimpedance amplifier (TIA) for photodiodes, ion chambers, and working electrode measurements
  • High impedance buffering for chemical sensors and capacitive sensors
Part Models 3
1ku List Price Starting From $13.42

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
ADA4530-1ARZ
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ADA4530-1ARZ-R7
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ADA4530-1ARZ-RL
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Evaluation Kit

Evaluation Kits 1

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EVAL-ADA4530-1

ADA4530-1 Evaluation Board

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EVAL-ADA4530-1

ADA4530-1 Evaluation Board

ADA4530-1 Evaluation Board

Features and Benefits

  • Footprint for ADA4530-1 8-lead SOIC package
  • Footprints for passive components
  • Available in buffer or transimpedance configuration
  • Easy modifications to other standard configurations
  • Guard ring to minimize leakage current
  • Assembled with metal shields
  • Enables quick prototyping
  • Easy connection to test equipment

Product Detail

The ADA4530-1R-EBZ is an evaluation board for the ADA4530-1 offered in an 8-lead SOIC package. The ADA4530-1R-EBZ is a 4-layer printed circuit board (PCB) designed to minimize leakage currents with its guard ring features for femtoampere input bias current (IB) measurement.

The ADA4530-1R-EBZ is available in two default configurations: buffer (ADA4530-1R-EBZ-BUF) and transimpedance (ADA4530-1R-EBZ-TIA). Both boards are populated with the necessary passive components, banana jacks/terminal blocks for supply voltages, BNC/terminal blocks for the output voltage, multiple test pins, and metal shields. All components are placed on the primary side with the exception of the triaxial (triax)/coaxial (coax) input connector (J1) and SHIELD3.

The ADA4530-1R-EBZ also has unpopulated resistor and capacitor pads that allows quick prototyping with different configurations, such as noninverting gain and inverting gain.

Specifications for the ADA4530-1 are provided in the ADA4530-1 data sheet available from Analog Devices, Inc. The ADA4530-1 data sheet and the AN-1373 Application Note should be consulted in conjunction with this user guide when using the evaluation board.

Figure 1 shows the top view of the evaluation board, and Figure 2 shows the bottom view. For more views of the evaluation board images, see the ADA4530-1R-EBZ Evaluation Board Photographs section.

Tools & Simulations

Tools & Simulations 5

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.

Reference Designs

Reference Designs 1

Femtoampere Measurement System Functional Diagram

Ultrahigh Sensitivity Femtoampere Measurement Platform

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CN0407

Ultrahigh Sensitivity Femtoampere Measurement Platform

CN0407

Circuits from the lab

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Ultrahigh Sensitivity Femtoampere Measurement Platform

Features and Benefits

  • Femtoampere measurements
  • Electrometer grade input amplifier
  • 20fA maximum input bias current @ 85°C
  • 24-bit sigma delta ADC
View Detailed Reference Design external link

Design & Integration Tools

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Videos

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