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Precision op amp integrates over-voltage protection circuitry

Norwood, Mass. — Analog Devices, Inc. (ADI) has introduced a highly integrated precision operational amplifier (op amp) with on-chip over-voltage protection circuitry. The ADA4091-2 dual rail-to-rail op amp reportedly delivers a reliable, accurate, easy-to-use alternative to competing discrete analog input solutions, while reducing the number of external components needed to ensure stable system operation.

The 1.5-MHz op amp, housed in an 8-lead LFCSP, features a 350-uA-per-channel supply current, a 0.5-V/us slew rate, and offset voltage of 500 uV maximum, which ensures system accuracy with varied sensor types in harsh operating environments while eliminating the need for cooling fans or other thermal management devices. The 36-V op amp protects up to 12 V above and below the supply rails at ±15 V and 25 V above and below the supply rails at ±5 V.

By providing localized signal conditioning and what the company calls the industry's best combination of low offset, low offset drift and wide gain-bandwidth, the ADA4091-2 delivers precision performance across a variety of sensor inputs, while the over-voltage protection feature prevents phase-inversion errors and excessive input current flows during transient or fault conditions. The performance of competing op amps must be evaluated to compensate for the error effects of discrete over-voltage circuitry on system performance, which adds a layer of complexity and uncertainty to the design process, said Analog Devices.

Pricing: $1.80 each in quantities of 1,000.
Availability: The ADA4091-2 is sampling now and will be available in production quantities in November.
Product information: ADA4091

Analog Devices Inc., www.analog.com

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