ADA4530-1

RECOMMENDED FOR NEW DESIGNS

ADA4530-1

Femtoampere Input Bias Current Electrometer Amplifier

RECOMMENDED FOR NEW DESIGNS

RECOMMENDED FOR NEW DESIGNS

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ADA4530-1 Pin Configuration slide

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ADA4530-1 Pin Configuration

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ADA4530-1 Pin Configuration slide

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ADA4530-1 Pin Configuration

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Part Models 3

1ku List Price Starting From $13.42

Features

Low input bias current
- ±20 fA maximum at T_A = 25°C (guaranteed at production test)
- ±20 fA maximum at −40°C < T_A < +85°C
- ±250 fA maximum at −40°C < T_A < +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

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

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Part Models 3

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Technical Documents 5

ADA4530-1: Femtoampere Input Bias Current Electrometer Amplifier Data Sheet (Rev.C) 10/13/2015

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UG-865: ADA4530-1 8-Lead SOIC Package Evaluation Board (Rev.A) 10/13/2015

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AN-1373: ADA4530-1 Femtoampere Level Input Bias Current Measurement 09/20/2023

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Guarded Limiters Improve High Impedance Sensor Dynamic Range 01/01/2016

Gas Chromatography Sensors Address Environmental Monitoring Needs 05/01/2024

Show More

Reference Materials 8

CN0407: Ultrahigh Sensitivity Femtoampere Measurement Platform (Rev.A) 04/24/2017

Current Noise in FET Input Amps 02/01/2020

Practical Tips for Measuring Ultralow Bias Current Using Commercial-Grade Lab Equipment 04/04/2022

Counting Electrons: Making Ultra-high Sensitivity Femtoamp Measurements 04/12/2017

Sensors and How to Use Them 02/29/2016

Video

3

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Video

2016-07-12

03:30

Electrometer-Grade Amplifier Improves Measurement Accuracy

Learn More

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Video

2016-11-28

01:18

ADA4530-1 Electrometer Op Amp: Measuring Femptoamp Currents

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Video

2015-10-14

02:58

ADA4530-1 Electrometer Op Amp with Integrated Guard Buffer

Learn More

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Design Resources 3

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
ADA4530-1ARZ	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
ADA4530-1ARZ-R7	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
ADA4530-1ARZ-RL	8-Lead SOIC	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

ADA4530-1ARZ
Pin/Package Drawing
8-Lead SOIC
Documentation

HTML Material Declaration

external-link

HTML Reliablity Data

external-link

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

ADA4530-1ARZ-R7
Pin/Package Drawing
8-Lead SOIC
Documentation

HTML Material Declaration

external-link

HTML Reliablity Data

external-link

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

ADA4530-1ARZ-RL
Pin/Package Drawing
8-Lead SOIC
Documentation

HTML Material Declaration

external-link

HTML Reliablity Data

external-link

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Circuit Recommendations 2

image of circuit card

Sensitive Photodiode Signal Chain

LTspice Simulation

image of circuit card

Photodiode Transimpedance Amplifier

LTspice Simulation

reference details image

EVAL-ADA4530-1

ADA4530-1 Evaluation Board

ADA4530-1R Image

EVAL-ADA4530-1

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

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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 (I_B) 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.

Resources

ZIP

ADA4530-1 Gerber Files

50.49 K

PDF

UG-865: ADA4530-1 8-Lead SOIC Package Evaluation Board (Rev.A)

3.54 M

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evaluation kit item images

EVAL-ADA4530-1

ADA4530-1 Evaluation Board

LTspice 1

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.

Lt Spice

ADA4530-1 - Operational Amplifiers (Op Amps)

Analog Photodiode Wizard

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

Analog Filter Wizard

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

Signal Chain Designer - BETA

Signal Chain Designer - BETA

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

SPICE Model 1

Simulation Model

SPICE Model

ADA4530 SPICE Macro Model

11.51 KB

Femtoampere Measurement System Functional Diagram

CN0407

Ultrahigh Sensitivity Femtoampere Measurement Platform

Femtoampere Measurement System Functional Diagram

EVAL-CN0407-SDPZ (Without Shield Installed)

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Ultrahigh Sensitivity Femtoampere Measurement Platform

Download

Print

Femtoampere Measurement System Functional Diagram

EVAL-CN0407-SDPZ (Without Shield Installed)

Femtoampere Measurement System Functional Diagram

EVAL-CN0407-SDPZ (Without Shield Installed)

CN0407

Circuits from the lab

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

Part Used 5

ADUM3151

ADP7182

ADR4525

AD7172-2

ADA4530-1

Design & Integration Tools

ZIP

CN0407 Design & Integration Files

1.96 M

Videos

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2014-07-24

01:25

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2017-04-07

01:20

Valeria

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2014-02-11

01:44

AnalogDevices-F04

Femtoampere Measurement System Functional Diagram

CN0407

Ultrahigh Sensitivity Femtoampere Measurement Platform

15 Weeks Ago

AD4530-1: Question about the GUARD pin

25 Weeks Ago

Is the 100TΩ value for the input impedance of the ADA4530-1 common or differencial?

1 Years Ago

Why don't we use PIN8 of ADA4530-1 as GUARD?

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