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
    • Pseudo differential analog input range
      • 0 V to VREF with VREF between 2.4 V and 5.1 V
    • Throughput: 600 kSPS
      • Zero latency architecture
    • 16-bit resolution with no missing codes
    • INL: ±2.5 LSB maximum, DNL: ±0.9 LSB maximum
    • Dynamic range: 92 dB, VREF = 5 V
    • SNR: 91 dB at fIN = 1 kHz, VREF = 5 V
    • THD: −102 dB at fIN = 1 kHz, VREF = 5 V
    • SINAD: 90.5 dB at fIN = 1 kHz, VREF = 5 V
  • Low power dissipation
    • Single-supply 2.5 V operation with 1.8 V to 5 V logic interface
    • 2.25 mW typical at 600 kSPS (VDD only)
    • 4.65 mW typical at 600 kSPS (total)
    • 75 μW typical at 10 kSPS
  • Proprietary serial interface
    • SPI-/QSPI-/MICROWIRE-/DSP-compatible
  • Daisy-chain multiple ADCs and busy indicator
  • Small footprint
    • 10-lead, 3 mm × 3 mm, monometallic wire bonding MSOP
    • 110-lead, 0.255 inches × 0.255 inches, monometallic wire bonding FLATPACK

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 speci-fied 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.


  • Oil and gas exploration
  • Avionics
  • Heavy industrial
  • High temperature environments
  • Scientific instrumentation

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.

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