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AD8222

PRODUCTION

Precision, Dual-Channel Instrumentation Amplifier

Data Sheet (Rev. B) Product Selection Table
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Overview

  • Two channels in small 4 mm × 4 mm LFCSP
  • Gain set with 1 resistor per amplifier (G = 1 to 10,000)
  • Low noise
    • 8 nV/√Hz at 1 kHz
    • 0.25 µV p-p (0.1 Hz to 10 Hz)
  • High accuracy dc performance (B grade)
    • 60 µV maximum input offset voltage
    • 0.3 µV/°C maximum input offset drift
    • 1.0 nA maximum input bias current
    • 126 dB minimum CMRR (G = 100)
  • Excellent ac performance
    • 140 kHz bandwidth (G = 100)
    • 13 µs settling time to 0.001%
  • Differential output option (single channel)
    • Fully specified
    • Adjustable common-mode output
  • Supply range: ±2.3 V to ±18 V
  • Download AD8222-KGD Data Sheet.
  • Available As Known Good Die and fully guaranteed to data sheet specifications

The AD8222 is a dual-channel, high performance instrumentation amplifier that requires only one external resistor per amplifier to set gains of 1 to 10,000.

The AD8222 is the first dual-instrumentation amplifier in the small 4 mm × 4mm LFCSP. It requires the same board area as a typical single instrumentation amplifier. The smaller package allows a 2× increase in channel density and a lower cost per channel, all with no compromise in performance.

The AD8222 can also be configured as a single-channel, differential output instrumentation amplifier. Differential outputs provide high noise immunity, which can be useful when the output signal must travel through a noisy environment, such as with remote sensors. The configuration can also be used to drive differential input analog-to-digital converters (ADCs). The AD8222 maintains a minimum CMRR of 80 dB to 4 kHz for all grades at G = 1. High CMRR over frequency allows the AD8222 to reject wideband interference and line harmonics, greatly simplifying filter requirements. The AD8222 also has a typical CMRR drift over temperature of just 0.07 µV/V/°C at G = 1.

The AD8222 operates on both single and dual supplies and only requires 2.2 mA maximum supply current for both amplifiers. It is specified over the industrial temperature range of −40°C to +85°C and is fully RoHS compliant.

For a single-channel version, see the AD8221.

Applications

  • Multichannel data acquisition for
    • ECG and medical instrumentation
    • Industrial process controls
    • Wheatstone bridge sensors
  • Differential drives for
    • High resolution input ADCs
    • Remote sensors
AD8222
Precision, Dual-Channel Instrumentation Amplifier
AD8222-fbl AD8222 Pin Configuration AD8222 Pin Configuration
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Documentation

Data Sheet 2

User Guide 1

Application Note 4

Technical Articles 2

Evaluation Design File 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • AD8222

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

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-AD8222

AD8222 Evaluation Board

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Product Details

The AD8222-EVALZ has two AD8222 instrumentation amplifier circuits. One circuit is configured for dual-channel operation, while the other is configured for single-channel, differential output operation. Inputs, outputs, references, and the supplies are routed to screw terminals for easy connectivity. See the AD8222-EVALZ data sheet for further details.


eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
EVAL-INAMP1

Instrumentation Amplifiers Evaluation Board User Guide

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Features and Benefits

  • Plug-and-play evaluation board using USB power source
  • Flexible power options – USB or external DC source
  • Edge-mounted Banana connectors provisions
  • On-board Reference Buffer

Product Details

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

EVAL-INAMP-RZ

The EVAL-INAMP-RZ is designed for evaluating instrumentation amplifiers in the legacy pinout. This board can be used to evaluate the AD8421, AD8422, AD8428, AD8429, AD8229, AD8227, AD8226, AD8228, and AD8221 instrumentation amplifiers. In addition to the basic in-amp connection, circuit options enable the user to adjust the offset voltage, apply an output reference, or provide shield drivers with user-supplied components.

EVAL-INAMP-RMZ

The EVAL-INAMP-RMZ board is identical to the EVAL-INAMP-RZ board, except that it features the MSOP pinout. This board can be used to evaluate the AD8422, AD8421, AD8227, AD8226, AD8228, AD8220, AD8222, and AD8236 in MSOP packages.

EVAL-AD8422ACPZ

The EVAL-AD8422ACPZ board is similar to the EVAL-INAMP-RZ and EVAL-INAMP-RMZ boards in terms of schematic functionality. EVAL-AD8422ACPZ, however, is explicitly designed for the AD8422ACPZ or the LFCSP package pinout. Features like on-board supply and on-board reference circuit are also available in the EVAL-AD8422ACPZ.
EVAL-AD8222
AD8222 Evaluation Board
EVAL-INAMP1
Instrumentation Amplifiers Evaluation Board User Guide
EVAL-INAMP-RMZ Evaluation Board Angle View EVAL-INAMP-RMZ Evaluation Board Top View EVAL-INAMP-RMZ Evaluation Board Bottom View EVAL-INAMP-RZ Evaluation Board Angle View EVAL-INAMP-RZ Evaluation Board Top View EVAL-INAMP-RZ Evaluation Board Bottom View

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