Op-amp with over-voltage protection

29 October 2008 Analogue, Mixed Signal, LSI

New from Analog Devices is a highly integrated precision operational amplifier with on-chip over-voltage protection circuitry. The ADA4091-2 provides industrial equipment designers with a reliable, accurate analog input solution.

Industrial amplifiers are subject to fault voltages from a variety of sources, including electromagnetic interference, damaged cabling, lightning strikes and other disturbances on the power grid, incorrect hookups to other system components and power-line surges when power to the system is restored after routine service or equipment upgrades. Such over-voltage conditions can cause phase inversion or damage the amplifier and other circuitry, resulting in system lock-up or outright failure.

The ADA4091-2’s performance is fully specified, including the device’s on-chip over-voltage circuitry. This simplifies equipment design and error analysis and results in more consistent output readings in industrial process controls, battery-powered instrumentation, power supply control and protection systems and remote sensors.

The 1,5 MHz op-amp features 350 μA per channel supply current, a 0,5 V/μs slew rate, and offset voltage of 500 μV. The 36 V device 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.

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