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INA212: Dual power supply capabilities

user5299097
Prodigy 55 points
Part Number: INA212

I want to use the INA212 to sense current over a resistor. However, I would like to power it with +5V and -5V, and not +5V and GND. The reason for this is that I would also be able to sense AC current through the resistor. I have simulate the component with the dual power supply rails and it seems to be working. Is it possible for you to confirm that a negative power supply connected to GND pin would be fine for the INA212 please? If not, could you redirect me to another sensing amplifier with gain of 1000 with about mentioned capabilities.

  • 0
    TI__Genius 17100 points

    Hi User5299097,

    Using +5V and -5V to measure AC signals is possible with the INA212. Simulated behavior will be close to what is expected.

    With this approach, keep in mind that REF should be equal to 0V to allow maximum swing and indication of polarity. A drawback to this is that noisy -5V supplies will cause distortion visible on the output. Ensure to use the cleanest supply possible here since the system will be on a “floating” ground.

    I hope this is helpful! Thank you for choosing TI parts.


    Best,
    Manuel Chavez

  • 0 in reply to Manuel Chavez
    Prodigy 55 points
    Hi Manuel,

    Thank you for confirming this for me, it helps a lot. I just could not find anything similar and as suitable to use for my design.

    Kind regards,
    Retha-Mari