Analog Devices has announced a precision micro-power op amp that can handle inputs well outside the supply voltage rails.
The inputs of chip, dubbed ADA4096-2, will survive 32V on top of the +ve rail and 32V below the negative rail.
"It is the industry's first precision op amp with more than +/-30V of integrated input over-voltage protection," said ADI. "Over-voltage protection operates without damage, glitching, or phase reversal, and since op amps can be damaged if the signal they are monitoring is live when its power supplies are not available, the protection was designed to remain active even when power is not applied."
Specified to operate from a 3-30V supply over -40 to 125°C, the device draws 60µA per amplifier "and features twice the bandwidth and half the voltage noise of its competitors", claimed the firm.
Unity gain bandwidth is 800kHz at 30V, 550kHz at 10V and 475kHz at 3V with 27nV√Hz noise.
Precision credentials are derived from the 35µV typical input offset voltage, which degrades to 400µV max over voltage and temperature, and typical drift of 1µV/°C.
Open loop gain is typically 125dB, and the amplifiers are unity-gain stable.
Applications are expected with industrial sensors, process controls, loop-powered industrial instrumentation and battery-powered medical devices.