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INA146 common-mode range

Nichole Oljaca
Prodigy 600 points
Other Parts Discussed in Thread: INA146, INA148, INA117
 It's a question regarding the common mode voltage range.  What is the minimum voltage to get the full common mode range? Is it possible with +15V and -5V? The optimum for the customer is a common mode range up to 108V (CM up to 120V with tolerances). Is this also 120V common mode possible with this device? Do you see other problems or optimization? The customer doesn't want to use resistive divider (accuracy), a gain of 1/10 is a better solution.
 
Do we have other devices in development for a gain of 1/10 and a common mode range of 100V or higher?
  • 0
    TI__Prodigy 600 points

    The INA146 CMV equation is 11*(V-) to [11(V+) - 1]....up to a maximum of +/-100. Split supplies of -5V and +15V would yield 11(-5) to (11*14): -55V to +100V.

    If the customer needs up to 108 or 120V CMV, then I'd suggest the INA117 or INA148 that both go up to the +/-200V range. These however do not have G=0.1 options.

    I'll follow up seperately with new developement ideas, but nothing short term to share.

    Thanks,

    niki

  • 0 in reply to Nichole Oljaca
    TI__Expert 8135 points

    Hi Niki,
     
    thanks a lot for your quick response. There is only one open question. It's only for my understanding (and for the customer): how is it possible to measure signals with an CM range of 100V even if the voltage supply is e.g. 15V.
     
    BR, Xaver