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AD8228

PRODUCTION

Low Gain Drift Precision Instrumentation Amplifier Fixed G = 10, 100

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Easy to use
  • Pin strappable gains of 10 and 100
  • Wide power supply range: ±2.3 V to ±18 V
  • DC specifications (B Grade, G = 10)
    • 2 ppm/°C gain drift
    • 0.02% gain error
    • 50 μV maximum input offset voltage
    • 0.8 μV/°C maximum input offset drift
    • 0.6 nA maximum input bias current
    • 100 dB CMRR
  • AC specifications
    • 650 kHz, –3 dB bandwidth (G = 10)
    • 2 V/μs slew rate
  • Low noise
    • 8 nV/√Hz, @ 1 kHz (G = 100)
    • 0.3 μV p-p from 0.1 Hz to 10 Hz (G = 100)

The AD8228 is a high performance instrumentation amplifier with very high gain accuracy. Because all gain setting resistors are internal and laser trimmed, gain accuracy and gain drift are better than can be achieved with typical instrumentation amplifiers.

Low voltage offset, low offset drift, low gain drift, high gain accuracy, and high CMRR make this part an excellent choice in applications that demand the best dc performance possible, such as bridge signal conditioning.

The AD8228 operates on both single and dual supplies. Because the part can operate on supplies up to ±18 V, it is well suited for applications where high common-mode input voltages are encountered. The AD8228 is available in 8-lead MSOP and SOIC packages.

Performance is specified over the entire industrial temperature range of −40°C to +85°C for all grades. Furthermore, the AD8228 is operational from −40°C to +125°C. For a pin-compatible amplifier with similar specifications, but with a gain range of 1 to 1000, see the AD8221.

APPLICATIONS

  • Weigh scales
  • Industrial process controls
  • Bridge amplifiers
  • Precision data acquisition systems
  • Medical instrumentation
  • Strain gages
  • Transducer interfaces
AD8228
Low Gain Drift Precision Instrumentation Amplifier Fixed G = 10, 100
AD8228 Application Circuit AD8228 Pin Configuration AD8228 Pin Configuration
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Documentation

Data Sheet 1

User Guide 2

Application Note 1

Technical Articles 1

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Software Resources

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Tools & Simulations

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

Evaluation Kits

eval board
schematic 1
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schematic 3
EVAL-INAMP

AD62x, AD822x, AD842x Series InAmp Evaluation Board

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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
schematic 4
schematic 5
schematic 6
schematic 7
schematic 8
schematic 9
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-INAMP
AD62x, AD822x, AD842x Series InAmp Evaluation Board
InAmp Evaluation Board InAmp Evaluation Board - Bottom View InAmp Evaluation Board - Top View
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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