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Original question:

INA330: INA330: Is Rset relative position to Rtherm important?

INA330: Application requires 0 degC to 50 degC range

Mike Tierney
Prodigy 60 points
Part Number: INA330

To maintain the desired 1.6 kHz filter for the larger temperature range, the value of Rg will have to be substantially reduced. Is there a lower limit specified for Rg?

  • 0
    TI__Mastermind 23050 points
    Hi Mike,

    Rg should be selected based on the full scale range you need and then Cfilt should be adjusted to set the cutoff frequency. As mentioned in the datasheet the filtering could also be applied after the buffer, which mitigates the need to change Rg. There is not a lower limit specified for Rg because it depends on your application. The output of the INA330 will be based on the differences in current between the thermistor and Rset and is limited to a maximum of 12.5uA. The minimum resistor you can use depends on the error and noise in your system and how small of a signal you can resolve.
  • 0 in reply to Zak Kaye
    TI__Genius 11135 points
    Mike

    We haven't heard back from you so we assume this answered your question. If not, post another reply below or create a new thread if this one has timed-out.

    Thanks
    Dennis
  • 0 in reply to Dennis Goeke
    Prodigy 60 points
    Hi Zak, Thank you for your feedback, it clarified the question I had regarding the filter.
    --Mike