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INA149: GND different

Kai Hsiao
Guru 12675 points
Part Number: INA149


Hi Sir 

May I know INA149 could be used to measure current shut with different GND side 

  • 0
    TI__Guru 68931 points

    Kai,

    On dual +/-15V supplies, INA149 can support the input common-mode voltage range up to +/-275 with respect to  supply ground.  Thus, it does not matter how you call the current shunt side voltage (ground, high-side, or low-side) BUT the only thing that you must make sure of is that the voltage on either side of the shunt does NOT exceed +/-275V relative to INA149 supply ground. Even though the input common-mode voltage may be up to +/-275V, because of INA149 fixed gain of 1, the differential input voltage (voltage across the shunt resistor) must be betweeen -13.5V and +13.5V - see below.

  • 0 in reply to Marek Lis
    TI__Genius 11135 points
    Kai

    We haven't heard back from you so we assume this answered your question. If not just post another reply below.

    Thanks
    Dennis
  • 0 in reply to Dennis Goeke
    Guru 12675 points

    Hi Dennis

    Thanks for your reply