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AD8421

RECOMMENDED FOR NEW DESIGNS

3 nV /√Hz, Low Power Instrumentation Amplifier

Part Models
17
1ku List Price
Starting From $2.77
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Part Details

  • Low power
    • 2.3 mA maximum supply current
  • Low noise
    • 3.2 nV/√Hz maximum input voltage noise at 1 kHz
    • 200 fA/√Hz current noise at 1 kHz
  • Excellent ac specifications 
    • 10 MHz bandwidth (G = 1)
    • 2 MHz bandwidth (G = 100)
    • 0.6 µs settling time to 0.001% (G = 10)
    • 80 dB CMRR to 20 kHz (G = 1)
    • 35 V/µs slew rate
  • High precision dc performance (AD8421BRZ)
    • 94 dB CMRR minimum (G = 1)
    • 0.2 μV/°C maximum input offset voltage drift
    • 1 ppm/°C maximum gain drift (G = 1)
  • 500 pA maximum input bias current
  • Inputs protected to 40 V from opposite supply
  • ±2.5 V to ±18 V dual supply (5 V to 36 V single supply)
  • Gain set with a single resistor (G = 1 to 10,000)
  • Available in 8-lead LFCSP, 8-lead MSOP, and 8-lead SOIC
  • Download AD8421-KGD Data Sheet
  • Available As Known Good Die and fully guaranteed to data sheet specifications

AD8421-EP supports defense and aerospace applications (AQEC standard)

  • Download AD8421-EP data sheet (pdf)
  • Military temperature range (−55°C to +125°C)
  • Controlled manufacturing baseline
  • One assembly/test site
  • One fabrication site
  • Enhanced product change notification
  • Qualification data available on request
  • V62/13625 DSCC Drawing Number
AD8421
3 nV /√Hz, Low Power Instrumentation Amplifier
AD8421 AD8421 Functional Block Diagram AD8421 Pin Configuration AD8421 Pin Configuration AD8421 Pin Configuration
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Documentation

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Hardware Ecosystem

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Modify Design LTspice Simulation
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Tools & Simulations

LTspice 1


Models for the following parts are available in LTspice:

  • AD8421

In-Amp Diamond Plot Tool

The Diamond Plot Tool is a web application that generates a configuration-specific Output Voltage Range vs. Input Common-Mode Voltage graph, also known as the Diamond Plot, for Analog Devices Instrumentation Amplifiers. Based on user inputs such as supply voltage, gain, and input signal range, the tool detects saturation and recommends in-amps for which the input signal is in-range and the configuration is valid. Avoid saturation, find the best in-amp for your design, and save time.

Open Tool

SPICE Model 1

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.

Open Tool
LTspice

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.


Evaluation Kits

eval board
EVAL-INAMP

AD62x, AD822x, AD842x Series InAmp Evaluation Board

Product Details

Analog Devices provides a line of evaluation boards designed to help users evaluate our instrumentation amplifiers in 8 pin packages. Access the user guide UG-261.

This user guide describes three generic evaluation boards that can be used to evaluate many of Analog Devices instrumentation amplifiers. For information on the performance of a specific instrumentation amplifier, see the data sheet for that instrumentation amplifier.

  • 3 generic, easy-to-use evaluation boards
    • Shipped with an assortment of Analog Devices in-amps
    • Solder in the in-amp to be tested
    • Test pins already populated
    • Decoupling capacitors already populated
  • EVAL-INAMP-62RZ board: Compatible with AD620, AD621, AD622, AD623, AD627, AD8223, AD8225,  LT1167, LT1168 and LT6370 in SOIC or PDIP
  • EVAL-INAMP-82RZ board: Compatible with AD8221, AD8226, AD8227, AD8228, AD8229, AD8421, AD8428, and AD8429 in SOIC package
  • EVAL-INAMP-82RMZ board: Compatible with AD8220, AD8221, AD8226, AD8227, AD8228, AD8236, and AD8421 in MSOP package

eval board
EVAL-ADMX2001

High-Performance Precision Impedance Analyzer Measurement Module

Features and Benefits

  • Complex impedance measurements
    • DC, 0.2Hz to 10MHz
  • 0.05% Basic Relative Accuracy
  • Wide measurement range
    • Resistance from 100μΩ to 20MΩ
    • Capacitance from 100aF to 160F
    • Inductance from 1nH to 1600H
  • Programmable test signal
    • 16-bit amplitude adjustment up to 2.25Vpk
    • Frequency resolution of 0.2Hz
    • 16-bit DC bias setting up to ±2.5V
  • DC resistance measurements
  • 18 impedance measurement formats for C, R, L, Z and Y
  • Automated multi-point and parametric sweeps
  • Calibration and fixture compensation functions
    • Automated calibration routines for measurement traceability
    • Calibration coefficient storage in non-volatile memory
    • Compensation eliminates the effect of fixture parasitics

For a complete evaluation solution, both boards must be purchased:

  • ADMX2001B
  • EVAL-ADMX2001EBZ

Product Details

The ADMX2001 is a measurement module that simplifies the development of impedance measurement systems or can be used to enhance the capabilities of existing test platforms. Using high-performance mixed-signal and processing algorithms, the ADMX2001 can measure changes in capacitance as small as 0.1fF and resistance values up to 20MΩ, often required to test semiconductor devices, electronic components, and sensors. Moreover, built-in measurement algorithms enable the ADMX2001 to deliver fully calibrated complex impedance or admittance measurement results in various formats, including parallel and series combinations of resistance, capacitance, and inductance.

Applications

  • Automated test equipment
  • Semiconductor characterization
  • Wafer acceptance test
  • Electrical Impedance Spectroscopy
  • Impedance network analysis
  • Battery test

EVAL-INAMP
AD62x, AD822x, AD842x Series InAmp Evaluation Board
InAmp Evaluation Board InAmp Evaluation Board - Bottom View InAmp Evaluation Board - Top View
EVAL-ADMX2001
High-Performance Precision Impedance Analyzer Measurement Module
EVAL-ADMX2001EBZKIT Evaluation Board EVAL-ADMX2001EBZKIT Evaluation Board - Top View ADMX2001 Evaluation Board ADMX2001 Evaluation Board - Top View ADMX2001 Evaluation Board - Bottom View EVAL-ADMX2001EBZ Evaluation Board EVAL-ADMX2001EBZ Evaluation Board - Top View EVAL-ADMX2001EBZ Evaluation Board - Bottom View

Reference Designs

Figure 1. EVAL-CN0560-FMCZ Simplified Block Diagram
CN0560 Circuits from the lab

High Precision, Wide Bandwidth Current Measurement Signal Chain

Features and Benefits

  • Selectable Current Input Range with Protection
  • 10 A, 10mA, 10uA Measurement Range
  • Oversampling Enables up to 111 dB of Dynamic Range
CN0560
High Precision, Wide Bandwidth Current Measurement Signal Chain
Figure 1. EVAL-CN0560-FMCZ Simplified Block Diagram
EVAL-CN0560-FMCZ Evaluation Board
EVAL-CN0560-FMCZ Evaluation Board - Top View
EVAL-CN0560-FMCZ Evaluation Board - Bottom View
CN-0560 and SDP-H1

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