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  2. Amplifiers
  3. Instrumentation Amplifiers
  4. AD8251


Overview

Features and Benefits

  • 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

Product Details

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
  • Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Evaluation Kits (2)

    Documentation & Resources

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  • 3rd Party Solutions (3)
  • Data Sheets (1)
  • Application Notes (1)
  • User Guides (1)
  • Technical Books (1)
  • Circuit Note (3)
  • Technical Articles (6)
  • Technical Articles

    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.

    In Amp Diamond Tool

    SPICE Models

    Reference Designs (3)

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD8251ARMZ Material Declaration Reliability Data 10-Lead MSOP
    AD8251ARMZ-R7 Material Declaration Reliability Data 10-Lead MSOP
    AD8251ARMZ-RL Material Declaration Reliability Data 10-Lead MSOP
    Wafer Fabrication Data

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