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ADS1100: nonlinearity

user6310072
Prodigy 10 points
Part Number: ADS1100

how to eliminate nonlinearity when measuring resistance around 0x2aaa? The conversion to DA is around this value somehow frozen :(

  • 0
    TI__Guru* 92655 points

    Hi,

    I'm not aware of any linearity issues through the input range of the ADC. The max INL should be ±0.0125% of the full-scale range. 

    Can you describe your schematic and the setup? There may be some schematic-related issue that could cause a non-linearity in the measurement. I can't think of any reason that the ADC would get stuck on 2AAA as a measurement.

    Joseph Wu

  • 0 in reply to Joseph Wu
    TI__Guru* 92655 points

    Hi,

    I hadn't heard back from you and I thought I'd check on your non-linearity problem. As I mentioned in my previous post, the max INL should be ±0.0125% of the full-scale range, and there shouldn't be any reason for a stuck code.

    I'll close this thread for now. However, if you continue to have problems, give me a few more details about how you see this problem as you change the input voltage. Post back and we can work on this more.


    Joseph Wu