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Precision op amp extends battery life

Norwood, Mass. — Analog Devices, Inc. claims its precision operational amplifier consumes 30 percent less power than similar devices — thereby enabling higher accuracy in battery-powered consumer, medical and safety devices.

The AD8500 is a precision CMOS op amp that features a 1-microamp maximum supply current. The device operates from a single supply voltage of +1.8 volts to +5.5 V or a dual supply voltage of ±0.9 V to ±2.75 V. The low voltage allows use with two cell batteries over the full discharge profile.

The AD8500 operational amplifier offers 1-millivolt max offset performance and 1 picoamp input bias current.

The ability to swing rail-to-rail at both the input and output helps maximize the dynamic range and signal-to-noise ratio in systems that operate at very low voltages, said Steve Sockolov, product line director, ADI's Precision Signal Processing Group. “The low offset voltage allows the AD8500 op amp to be used in systems with high gain without having excessively large output offset errors and provides high accuracy without the need for system calibration,” he said.

Applications for the AD8500 op amp, which is fully specified over the industrial temperature range, include electrocardiograms (ECGs), pulse monitors, glucose meters, smoke and fire detectors, security systems, gas detectors, backup battery sensors, insulin pumps and ultraviolet radiation (UV) detectors in cellular handsets.

Quiescent Current vs. Supply Voltage

The AD8500 precision op amp is available in production quantities. Housed in a 5-lead SC-70 package, it is priced at 70 cents each in 1,000-piece quantities. Click here for the preliminary AD8500 data sheet.

Analog Devices , 1-800-262-5643, www.analog.com.

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