High Temperature, 16-Bit, 600 kSPS PulSAR ADC
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
- Heavy industrial
- High temperature environments
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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Protecting ADC Inputs
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