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AD7981 High Temperature,16-BIT, 600 kSPS pulSAR® ADC

The AD7981 is a 16-bit, successive approximation, analog-to-digital converter (ADC) designed for high temperature operation. The AD7981 is capable of sample rates up to 600 kSPS while maintaining low power consumption from a single power supply, VDD. It is one of the fastest and highest accuracy, high temperature, successive approximation register (SAR) ADCs and 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 to 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. This package is designed for robustness at extreme temperatures, including mono-metallic wire bonding, and is 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.

Applications

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

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Reference Materials

• Circuit Notes：CN0365: 16-Bit, 600 kSPS, Low Power Data Acquisition System for High...
• Technical Articles：MS-2707: Harsh Environments Conquered - Low Power, Precision, High...