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OPA348 Improper output failure mode. (Part functions as a comparator)

Gerald Donovan
Prodigy 10 points
Other Parts Discussed in Thread: OPA348

We plan to use OPA348 in a safety monitoring circuit.  The  OPA348 will be configured as a follower and drive an ADC.  The rail voltage is 3.3 volts.  The input voltage is 0 VDC to 3.3 VDC current limited to less than 10 mA.  Are there any know failure modes of this part that will cause it to operate as a compartator and not as an amplifier?

 

Thanks

Gerald Donovan

Safety Eng

 

  • 0
    TI__Guru* 93105 points

    Hi Gerald,

    The OPA348 is rated as a rail-to-rail input voltage range device and when operated within that range the output will respond in a linear manner. The OPA348 has been tested for output inversion and does not invert when the input common-mode voltage range is exceeded. Also, it has been tested and for latch up per EIA/JESD78 over-voltage, over-current and does not exhibit any latch-up behavior.

    It should not behave as a comparator when operated under normal conditions as a follower amplifier.

    Regards, Thomas

    PA - Linear Applications Engineering