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AD8231-EP Absolute Max Input Current

Rubaiat Ali
on Dec 22, 2020

Hello,

We are using the AD8231-EP for an application which may result in the input voltage of the instrumentation amplifier exceeding its power supply. Currently we are planning to use resistors in series to limit the current into the input pins.

I have two questions:

- Will this method sufficiently protect the part form being damaged?

- What should the current going through the input ESD protection diodes be limited to? From my pervious experience typically this is 10mA, however, for this part it is not mentioned in the datasheet.

Thank you

  • 0
    •  Analog Employees 
    on Jan 27, 2021 7:13 AM 30 days ago

    Hi,

    The main difference I am seeing between AD8231 and AD8213-EP is the temperature range.
    The AD8231 is specified at Industrial Temp range of -40 to 125 degrees where as the AD8231-EP is in Military Temp Range which is -55 to 125 degrees.

    As you can see, the AD8231-EP data sheet refers to the AD8231 data sheet for more application and technical information.
    Please see page 1, General Description.

    Since the AD8231 DS specified limit of 10mA in case of over voltage, I think this is also applicable for AD8231-EP.
    Limiting resistor is a good way of limiting the current.

    Thanks and regards.