• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer

Analog IC Tips

Analog IC Design, Products, Tools Layout

  • Products
    • Amplifiers
    • Clocks & Timing
    • Data Converters
    • EMI/RFI
    • Interface & Isolation
    • MEMS & Sensors
  • Applications
    • Audio
    • Automotive/Transportation
    • Industrial
    • IoT
    • Medical
    • Telecommunications
    • Wireless
  • Learn
    • eBooks / Tech Tips
    • FAQs
    • EE Learning Center
    • EE Training Days
    • Tech Toolboxes
    • Webinars & Digital Events
  • Resources
    • Design Guide Library
    • Digital Issues
    • Engineering Diversity & Inclusion
    • LEAP Awards
    • Podcasts
    • White Papers
    • DesignFast
  • Video
    • EE Videos
    • Teardown Videos
  • EE Forums
    • EDABoard.com
    • Electro-Tech-Online.com
  • Engineering Training Days
  • Advertise
  • Subscribe

Electrometer-Grade Amplifier from Analog Devices

October 28, 2015 By Patrick Curran

Analog Devices, Inc. today introduced an electrometer-grade operational amplifier that enables chemical analysis instruments to achieve the highest level of precision and data repeatability over a wider temperature range in a compact solution that reduces overall bill of materials and design footprint. The ADA4530-1 op amp achieves this with an input bias current that is at least 20 times lower than competing devices. Such low bias current makes the ADA4530-1 ideal for interfacing to sensors that are sensitive to output loading such as photo diodes and other high output impedance sensors often used in precision monitoring/analysis equipment such as spectrophotometers, chromatographs and mass spectrometers, as well as potentiostatic and amperostatic coulometry measurement devices. The new amp also can be used as a front-end amplifier for picoammeter and coulombmeter instrumentation systems, as a transimpedance amplifier for photodiodes, ion chambers, and working electrode measurements, or as a high-impedance buffer for chemical and capacitive sensors.

ADA4530

• Download the data sheet, view product page and order samples or evaluation boards: http://www.analog.com/ADA4530-1
• Get questions answered by ADI engineers on EngineerZone®, ADI’s online technical support community: https://ez.analog.com/community/amplifiers
• Watch the ADA4530-1 video

The ADA4530-1 op amp’s input bias current is 250 fA at 125°C, which is 20 times lower than competitive amplifiers, and drops to 20 fA at 85°C, which is 50 times lower than competing devices. Additionally, the ADA4530-1 is the only op amp able to specify the same input bias current of 20 fA from room temperature to 85°C and is the only amp in its class to be fully production tested for bias current at room temperature and 125°C. The closest competing op amps are rarely specified at 125°C and none are production tested at room temperature for the bias current, which prevents system designers from taking full advantage of the sensitivity of their sensors, because they need to leave some guard band for a wider variation of the bias current.

The ADA4530-1 also incorporates an on-chip guard buffer that tracks the input common-mode voltage and provides an output that is useful for driving PCB guard rings or the guard shield of interconnecting shielding used to reduce the effects of stray capacitance on the sensitive connections between the sensor and the amplifier. This simplifies sensor interface design by removing the need for the customer to design a separate circuit to provide the required output drive, thus reducing design time, cost, and PCB space.

ADA4530-1 Electrometer-Grade Operational Amplifier Key Features
• Ultra-low bias current
—> 20 fA @ 25°C max (Production Tested)
—> 20 fA @ 85°C max
—> 250 fA @ 125°C max (Production Tested)
• Integrated guard buffer
• Wide supply voltage: ±2.5 to ±8 V or 5 to 16 V

Analog Devices
www.analog.com

Filed Under: Amplifiers, Analog ICs, Products Tagged With: analogdevices

Primary Sidebar

Featured Contributions

Design a circuit for ultra-low power sensor applications

Active baluns bridge the microwave and digital worlds

Managing design complexity and global collaboration with IP-centric design

PCB design best practices for ECAD/MCAD collaboration

Open RAN networks pass the time

More Featured Contributions

EE TECH TOOLBOX

“ee
Tech Toolbox: 5G Technology
This Tech Toolbox covers the basics of 5G technology plus a story about how engineers designed and built a prototype DSL router mostly from old cellphone parts. Download this first 5G/wired/wireless communications Tech Toolbox to learn more!

EE LEARNING CENTER

EE Learning Center
“analog
EXPAND YOUR KNOWLEDGE AND STAY CONNECTED
Get the latest info on technologies, tools and strategies for EE professionals.

EE ENGINEERING TRAINING DAYS

engineering

RSS Current EDABoard.com discussions

  • Diode recovery test Irrm timing.
  • How to make string LEDs?
  • The Analog Gods Hate Me
  • Battery Deep Discharge – IC Workarounds?
  • Safe Current and Power Density Limits in PCB Copper(in A/m² and W/m³) simulation

RSS Current Electro-Tech-Online.com Discussions

  • Raise your hand if your car had one of these:
  • Tektronix 2235 channel 1 trace unstable
  • How to make string LEDs?
  • Wideband matching an electrically short bowtie antenna; 50 ohm, 434 MHz
  • The Analog Gods Hate Me
“bills

Design Fast

Component Selection Made Simple.

Try it Today
design fast globle

Footer

Analog IC Tips

EE WORLD ONLINE NETWORK

  • 5G Technology World
  • EE World Online
  • Engineers Garage
  • Battery Power Tips
  • Connector Tips
  • DesignFast
  • EDA Board Forums
  • Electro Tech Online Forums
  • EV Engineering
  • Microcontroller Tips
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips

ANALOG IC TIPS

  • Subscribe to our newsletter
  • Advertise with us
  • Contact us
  • About us

Copyright © 2025 · WTWH Media LLC and its licensors. All rights reserved.
The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media.

Privacy Policy