ADC with internal reference delivers lowest power in smallest package

ADC with internal reference delivers lowest power in smallest package

The 12-bit, 1-MSPS AD7091R SAR (successive approximation register) A/D converters with internal 2.5-V reference is designed for USB or battery powered data acquisition modules, handheld meters, field instruments, energy harvesting applications and medical devices such as portable electrocardiograms and heart rate monitors. The company claims that the device dissipates over 70% lower power than the closest SAR ADC competitor, in a package that is 33% smaller than competing 12-bit converters with internal reference.

The device draws 349 μA typical at 3 V when operating at 1-MSPS. The device’s power automatically scales with throughput. It also draws 264-nA power down current and 21.6µA standby current.

Additional features include a power supply voltage of 2.7 to 5.25 V, a dc accuracy of ±1 LSB INL, a drift of 4.5 ppm/°C, and a serial interface voltage of 1.65 to 5.25 V. Operating voltage is from –40° to 125°C and housing is in 10-lead, 3 × 2 mm LFCSP and 10-lead MSOP packages. ($2.15 ea/1,000; EVAL-AD7091RSDZ evaluation board, $59.00 — available now)

By Christina Nickolas

Analog Devices , Wilmington , MA
Sales 800-262-5643
www.analog.com