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AD8421ARZ

ADIAD8421ARZ

Analog Devices Inc.
Instrumentation Amplifier 1 Circuit 8-SOIC
NRND6,954 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The AD8421ARZ is a low-power, high-speed instrumentation amplifier designed for high-performance signal conditioning. It offers an exceptionally high slew rate of 35V/us and a 10 MHz bandwidth, making it suitable for fast-acting data acquisition systems. This single-circuit IC operates over a wide supply range from 5V to 36V while maintaining a low input bias current of 1 nA.

Why Choose This Part

The AD8421ARZ provides a rare combination of high speed and low power, consuming only 2mA of supply current while delivering 35V/us slew rates. Its low input bias current of 1 nA minimizes errors when interfacing with high-impedance sources. Additionally, the wide supply span up to 36V provides significant headroom for industrial voltage rails.

Applications

Medical Instrumentation
Ideal for ECG and patient monitoring systems where low noise and high input impedance are critical for signal integrity.
Industrial Process Control
Used in PLC analog input modules to amplify small differential signals from remote sensors in noisy environments.
High-Speed Data Acquisition
The 10 MHz bandwidth allows for accurate amplification of fast-changing signals before digitization by an ADC.
Precision Strain Gage Interfaces
Excellent for bridge-based sensors due to its low 60 uV offset voltage and high common-mode rejection.

Key Specifications

Slew Rate 35V/us
Mounting Type Surface Mount
-3db Bandwidth 10 MHz
Amplifier Type Instrumentation
Package / Case 8-SOIC (0.154", 3.90mm Width)
Current - Supply 2mA
Number of Circuits 1
Current - Input Bias 1 nA
Operating Temperature -40degC ~ 85degC
Voltage - Input Offset 60 uV
Supplier Device Package 8-SOIC
Current - Output / Channel 65 mA
Voltage - Supply Span (Max) 36 V
Voltage - Supply Span (Min) 5 V

Getting Started

Designers should use the AD8421-EVALZ evaluation board to quickly characterize the amplifier's performance. Ensure that a 0.1 uF ceramic capacitor is placed as close as possible to the supply pins to maintain stability at high speeds. Gain is set using a single external resistor, allowing for easy adjustment in the prototype stage.

AD8421 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Current - Input Bias Voltage - Input Offset Stock
AD8421ARZ (this part) SOIC-8 1 nA 60 uV 6,954
AD8421BRZ SOIC-8 100 pA 25 uV 2,584
AD8421ARMZ TSSOP-8 1 nA 60 uV 16
AD8421ARZ-RL Reel SOIC-8 1 nA 60 uV 7,801
AD8421ARZ-R7 (Analog Devices) SOIC-8 1 nA 60 uV 1,528
Also available as: AD8421ARMZ-RL

Also Consider

INA128UA TITexas Instruments - An industry-standard general-purpose instrumentation amplifier suitable for lower bandwidth precision applications.
AD8221ARZ ADIAnalog Devices Inc. - Offers excellent common-mode rejection ratio (CMRR) over frequency for high-precision industrial measurements.