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Amps promise high accuracy

Norwood, Mass. — Analog Devices Inc. said its precision amplifiers provide a combination of high accuracy, low power, small size and low price.

The auto-zero amplifier (AD8538) is said to offer the best accuracy versus power. Requiring a supply current of 150 uA, the amplifier boasts three times better temperature drift performance (.01 uV/degree C offset drift) compared to the closest competing device — a drift performance level equivalent to products requiring over 1 mA of supply current, said Steve Sockolov, ADI's product line director, Precision Signal Processing group. The device touts 12-uV offset maximum and 1-uV peak to peak low-frequency noise.

The auto-zero amp is intended for signal paths with very low offset voltage and offset voltage drift over time and temperature. Applications include medical equipment, pressure and thermal sensors and automotive electronics.

The AD8613, AD8617 and AD8619 devices are single, dual, and quad operational amps with rail-to-rail inputs and outputs that deliver 50 percent lower noise and 30 percent lower power with twice the precision of competing devices, Sockolov said. Fully guaranteed low-voltage operation down to 1.8 V makes the AD861x family practical for battery-operated devices, such as temperature monitors and carbon dioxide detectors, he said.

The AD8613 family features a supply current of 38 uA maximum and voltage operation from 1.8 V to 5 V. The devices achieve high levels of precision in consumer-medical and low-cost industrial applications with low offset voltage of 2 mV max, ultra-low input bias current of 1 pA max and low noise of 22 nV/√ Hz, Sockolov said.

The AD8538 (see related CMRR vs. Frequency chart below) is available now in production quantities. It comes in both TSOT-23 and narrow SOIC-8 packages and is priced at 89 cents per unit in 1,000-piece quantities. Click here for the AD8538 data sheet.

The single AD8613 is sampling now with production planned for January. The AD8613 comes in both SC-70 and 5-lead TSOT packages and is priced at 45 cents per unit in same quantities. Click here for the AD8613 data sheet.

The dual AD8617 and quad AD8619 are available in production quantities now. The AD8617 is packaged in 8-lead MSOP and 8-lead narrow SOIC and is
priced at 70 cents per unit in 1,000-piece quantities. Click here for the AD8617 data sheet.

The AD8619 is packaged in 14-lead TSSOP and 14-lead SOIC and is priced at $1.10 in same quantities. Click here for the AD8619 data sheet.

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

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