AD8421
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AD8421

3 nV /√Hz, Low Power Instrumentation Amplifier

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 17
1ku List Price Starting From $2.77
Features
  • 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
Additional Details
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The AD8421 is a low cost, low power, extremely low noise, ultralow bias current, high speed instrumentation amplifier that is ideally suited for a broad spectrum of signal conditioning and data acquisition applications. This product features extremely high CMRR, allowing it to extract low level signals in the presence of high frequency common-mode noise over a wide temperature range.

The 10 MHz bandwidth, 35 V/µs slew rate, and 0.6 µs settling time to 0.001% (G = 10) allow the AD8421 to amplify high speed signals and excel in applications that require high channel count, multiplexed systems. Even at higher gains, the current feedback architecture maintains high performance; for example, at G = 100, the bandwidth is 2 MHz and the settling time is 0.8 µs. The AD8421 has excellent distortion performance, making it suitable for use in demanding applications such as vibration analysis.

The AD8421 delivers industry-leading 3 nV/√Hz input voltage noise and 200 fA/√Hz current noise with only 2 mA quiescent current, making it an ideal choice for measuring low level signals. For applications with high source impedance, the AD8421 employs innovative process technology and design techniques to provide noise performance that is limited only by the sensor.

The AD8421 uses unique protection methods to ensure robust inputs while still maintaining very low noise. This protection allows input voltages up to 40 V from the opposite supply rail without damage to the part.

A single resistor sets gains between 1 and 10,000. The reference pin can be used to apply a precise offset to the output voltage.

The AD8421 performance is specified from −40°C to +85°C for the 8-lead MSOP and SOIC packages, and from −40°C to 125°C for the 8-lead LFCSP package.

Applications

  • Medical instrumentation
  • Precision data acquisition
  • Microphone preamplification
  • Vibration analysis
  • Multiplexed input applications
  • ADC driver
Part Models 17
1ku List Price Starting From $2.77

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD8421-KGD-WP
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AD8421ACPZ-R7
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AD8421ACPZ-RL
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AD8421ARMZ
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AD8421ARMZ-R7
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AD8421ARMZ-RL
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AD8421ARZ
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AD8421ARZ-R7
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AD8421ARZ-RL
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AD8421BRMZ
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AD8421BRMZ-R7
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AD8421BRMZ-RL
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AD8421BRZ
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AD8421BRZ-R7
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AD8421BRZ-RL
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AD8421TRMZ-EP
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AD8421TRMZ-EP-R7
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Product Lifecycle

PCN

Apr 4, 2023

- 22_0142

Qualification of an Alternate Wafer Fab for High Voltage Bipolar Products (HVBIP) to Analog Devices, Inc. Wilmington MA

AD8421-KGD-WP

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AD8421ACPZ-R7

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AD8421ACPZ-RL

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AD8421ARMZ

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AD8421ARMZ-R7

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AD8421ARMZ-RL

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AD8421ARZ

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AD8421ARZ-R7

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AD8421ARZ-RL

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AD8421BRMZ

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AD8421BRMZ-R7

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AD8421BRMZ-RL

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AD8421BRZ

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AD8421BRZ-R7

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AD8421BRZ-RL

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AD8421TRMZ-EP

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AD8421TRMZ-EP-R7

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Apr 4, 2023

- 22_0142

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Qualification of an Alternate Wafer Fab for High Voltage Bipolar Products (HVBIP) to Analog Devices, Inc. Wilmington MA

AD8421-KGD-WP

PRODUCTION

AD8421ACPZ-R7

PRODUCTION

AD8421ACPZ-RL

PRODUCTION

AD8421ARMZ

PRODUCTION

AD8421ARMZ-R7

PRODUCTION

AD8421ARMZ-RL

PRODUCTION

AD8421ARZ

PRODUCTION

AD8421ARZ-R7

PRODUCTION

AD8421ARZ-RL

PRODUCTION

AD8421BRMZ

PRODUCTION

AD8421BRMZ-R7

PRODUCTION

AD8421BRMZ-RL

PRODUCTION

AD8421BRZ

PRODUCTION

AD8421BRZ-R7

PRODUCTION

AD8421BRZ-RL

PRODUCTION

AD8421TRMZ-EP

PRODUCTION

AD8421TRMZ-EP-R7

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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EVAL-ADMX2001

High-Performance Precision Impedance Analyzer Measurement Module

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EVAL-ADMX2001

High-Performance Precision Impedance Analyzer Measurement Module

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 Detail

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
reference details image

EVAL-INAMP

AD62x, AD822x, AD842x Series InAmp Evaluation Board

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EVAL-INAMP

AD62x, AD822x, AD842x Series InAmp Evaluation Board

AD62x, AD822x, AD842x Series InAmp Evaluation Board

Product Detail

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
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.

Reference Designs

Reference Designs 1

Figure 1. EVAL-CN0560-FMCZ Simplified Block Diagram

High Precision, Wide Bandwidth Current Measurement Signal Chain

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CN0560

High Precision, Wide Bandwidth Current Measurement Signal Chain

CN0560

Circuits from the lab

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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
View Detailed Reference Design external link

Design & Integration Tools

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