A/D converter with internal reference delivers low power and high accuracy

Analog Devices has introduced the first product in a series of ultra-low-power, 12-bit, 1-MSPS SAR (successive approximation register) A/D converters with an internal 2.5-V reference. The new A/D converter is designed for USB (universal serial bus) or battery powered data acquisition modules, handheld meters, field instruments, energy harvesting applications and medical devices such as portable electrocardiograms and heart rate monitors.

Thought to be the most power-efficient converter in its class, the device dissipates over 70 percent lower power than the closest SAR A/D converter competitor, in a package that is 33 percent smaller than competing 12-bit converters with internal reference.

“The AD7091R operates at over 3.5 times the power efficiency of competing A/D converters, and of discrete ADC and reference two-chip alternatives,” said Mike Britchfield, vice president, Industrial and Instrumentation Group, Analog Devices. “The significant power performance advantage was designed specifically for system engineers working within stringent system power constraints.”

The AD7091R core draws 349 µA typical at 3 V when operating at 1-MSPS. The device’s power automatically scales with throughput. It draws 264-nA power down current and 21.6µA standby current, which allows designers to further optimise energy consumption for intermittent or one-shot conversions. The new device also achieves a 4.5 ppm/°C reference temperature coefficient.



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