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INA121 Parameter drift over Operating Temperature Range

Shihab
Expert 1225 points

Other Parts Discussed in Thread: INA121

Hi,

I wanted to use INA121 for an application where ambient will be from -55 to 95degC. Gain setting will be 1. As per page-2 of datasheet the max gain error for INA121U is 0.05% at 25degC. Gain vs temperature is 10ppm/degC max. Can I consider this factor to calculate the gain error at 95degC and -55degC even if the datasheet is specified for -40to +85? Also can I take Offset voltage drift vs temperature +/-5uV/degc?

Also few of the graphs provide the parameter variation from -55 to +125degC (eg: bias current vs temp and Quiscent current Vs temp etc). Can I consider this grapgh when doing analysis for -55 to +95 degC operation?

Thanks,

Shihab.

  • 0
    TI__Genius 12375 points

    Shihab,

    Outside of the specified temperature range the parameters in the datasheet will most likely no longer adhere to the maximums defined in the spec table. Therefore it would be unrealistic to use the max spec's to calculate offset and gain error outside of the temperature range. The curves can be used for analysis outside of the specified temperature range, but remember that the graph value is only a typical specification, and there can be variation of the absolute value at any temperature. The overall trends over temperature should be similar to the graph though.