Two engineers working in the lab

Save time and deliver your solutions faster with ADI’s new suite of precision technology signal chains. Align your applications ranging from Smart Industry to Instrumentation, Electrification to Digital Health, to exactly the right precision technology combinations.

Tailor your signal chain with confidence

AD8251

PRODUCTION

10 MHz, G = 1, 2, 4, 8 iCMOS® Programmable Gain Instrumentation Amplifier

Data Sheet (Rev. B) Product Selection Table
Viewing:

Overview

  • Small package: 10-lead MSOP
  • Programmable gains: 1, 2, 4, 8
  • Digital or pin-programmable gain setting
  • Wide supply: ±5 V to ±15 V
  • Excellent dc performance
    High CMRR: 98 dB (minimum), G = 8
    Low gain drift: 10 ppm/°C (maximum)
    Low offset drift: 1.8 μV/°C (maximum), G = 8

EXCELLENT AC PERFORMANCE

  • Fast settling time: 785 ns to 0.001% (maximum)
  • High slew rate: 20 V/μs (minimum)
  • Low distortion: −110 dB THD at 1 kHz,10 V swing
  • High CMRR over frequency: 80 dB to 50 kHz (minimum)
  • Low noise: 18 nV/√Hz, G = 10 (maximum)
  • Low power: 4 mA

The AD8251 is an instrumentation amplifier with digitally programmable gains that has GΩ input impedance, low output noise, and low distortion, making it suitable for interfacing with sensors and driving high sample rate analog-to-digital converters (ADCs). It has high bandwidth of 10 MHz, low THD of −110 dB, and fast settling time of 785 ns (maximum) to 0.001%. Offset drift and gain drift are guaranteed to 1.8 μV/°C and 10 ppm/°C, respectively, for G = 8. In addition to its wide input common voltage range, it boasts a high common-mode rejection of 80 dB at G = 1 from dc to 50 kHz. The combination of precision dc performance coupled with high speed capabilities makes the AD8251 an excellent candidate for data acquisition. Furthermore, this monolithic solution simplifies design and manufacturing and boosts performance of instrumentation by maintaining a tight match of internal resistors and amplifiers.

The AD8251 user interface consists of a parallel port that allows users to set the gain in one of two different ways (see Figure 1 in data sheet for the functional block diagram). A 2-bit word sent via a bus can be latched using the WR input. An alternative is to use transparent gain mode where the state of logic levels at the gain port determines the gain.

The AD8251 is available in a 10-lead MSOP package and is specified over the −40°C to +85°C temperature range, making it an excellent solution for applications where size and packing density are important considerations.

Applications

  • Data acquisition
  • Biomedical analysis
  • Test and measurement

    • AD8251
    10 MHz, G = 1, 2, 4, 8 iCMOS® Programmable Gain Instrumentation Amplifier
    AD8251-fbl 30043660AD8251-pc
    Add to myAnalog

    Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

    Create New Project
    Ask a Question

    Documentation

    Data Sheet 1

    User Guide 1

    Application Note 1

    Technical Articles 2

    Learn More
    Add to myAnalog

    Add media to the Resources section of myAnalog, to an existing project or to a new project.

    Create New Project

    Software Resources

    Can't find the software or driver you need?

    Request a Driver/Software

    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
    EVAL-AD8251

    AD8251 Evaluation Board

    Buy Now View Details

    Features and Benefits

    • Does not require software to operate
    • Runs from dual supply (±7 to ±15 V)
    • Gain selection through DIP switches
    • Numerous test points for external stimulus
    • Signal paths use SMA connectors

    Product Details

    The AD8251-EVALZ user guide details how the AD8251- EVALZ evaluation board evaluates the AD8251. The user guide outlines the basic connections required to evaluate the AD8251 and describes the switch settings available to obtain desired outputs.

    Many configuration options are available on the AD8251- EVALZ evaluation board that allow additional input filtering and output filtering if there is a noisy environment. The logic control is covered with an on-board 5.0 V regulator and a dual in-line package (DIP) switch. However, these logic signals can be overridden and clipped on by way of the on-board test points if the DIP switch has each position set to open.

    eval board
    schematic 2
    schematic 3
    schematic 4
    schematic 5
    schematic 6
    schematic 7
    schematic 8
    schematic 9
    EVAL-ADMX2001

    High-Performance Precision Impedance Analyzer Measurement Module

    Buy Now View Details

    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-AD8251
    AD8251 Evaluation Board
    AD8251-EVALZ Image
    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

    CN-0393 Simplified Schematic Diagram
    CN-0393 Simplified Schematic Diagram
    Photograph of EVAL-CN0393-FMCZ Board
    CN0393 Circuits from the lab

    Bank Isolated, 2-Channel, 16-Bit, 500 kSPS, Simultaneous Sampling Signal Chain Featuring μModule Data Acquisition System

    View Detailed Reference Design

    Features and Benefits

    • 2-channel, 16-bit 500kSPS simultaneous sampling
    • Bank isolated
    • Complete data acquisition system

    Part Used

    Design & Integration Tools

    Videos

    • lazy blur
      VIDEO · 2017-01-26 02:28
      Reducing Challenges in the Precision Conversion Design Cycle
    Multichannel Data Acquisition Simplified Circuit
    Multichannel Data Acquisition Simplified Circuit
    EVAL-CN0345-SDZ Evaluation Hardware
    CN0345 Circuits from the lab

    Low Power, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial-Level Signals

    View Detailed Reference Design

    Features and Benefits

    • 18-Bit 8-Channel Data Acquisition System
    • Single-ended and differential industrial signal levels
    • 750 kSPS per channel switching rate
    • 240mW at maximum sampling rate
    Isolated Multichannel Data Acquisition Simplified Circuit
    Isolated Multichannel Data Acquisition Simplified Circuit
    EVAL-CN0385-FMCZ Evaluation Hardware
    CN0385 Circuits from the lab

    Isolated, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial Level Signals

    View Detailed Reference Design

    Features and Benefits

    • Multichannel Isolated Data Acquisition System
    • Industrial Signal Levels
    • 18-bit, 2MSPS Conversion
    • 750kHz Channel Switching Rate
    CN0393
    Bank Isolated, 2-Channel, 16-Bit, 500 kSPS, Simultaneous Sampling Signal Chain Featuring μModule Data Acquisition System
    CN-0393 Simplified Schematic Diagram
    Photograph of EVAL-CN0393-FMCZ Board
    CN0345
    Low Power, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial-Level Signals
    Multichannel Data Acquisition Simplified Circuit
    EVAL-CN0345-SDZ Evaluation Hardware
    CN0385
    Isolated, Multichannel Data Acquisition System with PGIA for Single-Ended and Differential Industrial Level Signals
    Isolated Multichannel Data Acquisition Simplified Circuit
    EVAL-CN0385-FMCZ Evaluation Hardware

    Latest Discussions

    1 Years Ago
    Selection of unit gain instrumentation amplifier
    1 Years Ago
    AD8251/AD8253 GAIN Problem
    2 Years Ago
    Interceptors Update
    View related discussion on EngineerZone®

    Recently Viewed