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LMP91000: Using TIA amplifier as differential

Barnesy3113
Prodigy 110 points
Part Number: LMP91000

Hello,

I'm presently working on a project which uses electrochemical sensors, but I don't want to immediately exclude the future use of catalytic type or semiconductor type sensors.  This may be an exotic user case that hasn't been tested, but I thought it was worth asking whether or not I can use the TIA amplifier as a differential amplifier (like it's just an op-amp).  I've included an image of a rough sketch for what I'm trying to do.  Can you please verify that I can use the LMP91000 in this configuration?  Are there any caveats I should know about when using the LMP91000 in this way?

Thank you!

  • 0
    TI__Expert 5695 points
    Hi Barnesy,
    The use case that you are proposing is not being evaluated with the LMP91000 device. We won't be able to comment or recommend on a non-intended use case. I will recommend to use a discrete implementation for your differential amplifier since the Vref inputs are supposed to be used with a DC signal and may be some limitations on a dynamic signal going inside (e.g. decoupling caps) .

    TI has a large portfolio of Op Amps that can be used you can start with the following link if you know your system requirements:
    www.ti.com/.../overview.html

    Regards,
    Jose