Features and Benefits

  • Download AD7981-KGD Data Sheet. Available as Known Good Die and fully guaranteed to data sheet specifications.
  • Extreme high temperature operation
    • Specified temperature range
      • −55°C to +210°C (10-lead FLATPACK)
      • −55°C to +175°C (10-Lead MSOP)
  • High performance
    • 16-bit resolution with no missing codes
    • 600 kSPS throughput with no latency/pipeline delay
    • SNR: 91 dB typical at 1 kHz input frequency
    • THD: −102 dB typical at 1 kHz input frequency
    • INL: ±2.5 LSB maximum, DNL: ±0.9 LSB maximum
  • Low power
    • 2.25 mW typical at 600 kSPS (VDD only)
    • 4.65 mW typical at 600 kSPS (total)
    • 75 µW typical at 10 kSPS
  • Small footprint
    • 10-lead, 3 mm × 3 mm, monometallic wire bonding MSOP
    • 10-lead, 0.255 mm × 0.255 mm, monometallic wire bonding FLATPACK
  • Pseudo differential analog input range
    • 0 V to VREF with VREF between 2.4 V and 5.1 V
  • Single-supply 2.5 V operation with 1.8 V to 5 V logic interface
  • SPI-/QSPI-/MICROWIRE-/DSP-compatible digital interface
  • Daisy-chain multiple ADCs and busy indicator

Product Details

The AD7981 is a 16-bit, successive approximation, PulSAR® analog-to-digital converter (ADC) designed for high temperature operation. The AD7981 is capable of sample rates of up to 600 kSPS while maintaining low power consumption from a single power supply, VDD. It is a fast throughput, high accuracy, high temperature,successive approximation register (SAR) ADC, packaged in a small form factor with a versatile serial port interface (SPI).

On the CNV rising edge, the AD7981 samples an analog input, IN+, between 0 V and REF with respect to a ground sense, IN−. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. The device power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply, VIO.

For space constrained applications, the AD7981 is available in a 10-lead mini small outline package (MSOP) with operation specified from −55°C to +175°C and 10-lead ceramic flat package (FLATPACK) with operation specified from −55°C to +210°C. These packages are designed for robustness at extreme temperatures, including monometallic wire bonding, and are qualified for up to 1000 hours of operation at the maximum temperature rating.

The AD7981 is a member of a growing series of high temperature qualified products offered by Analog Devices, Inc. For a complete selection of available high temperature products, see the high temperature product list and qualification data available at www.analog.com/hightemp.


  • Downhole drilling and instrumentation
  • Avionics
  • Heavy industrial
  • High temperature environments

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input


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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.