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INA901-SP: Worst Case Error / Accuracy

Rolf Lerch
Prodigy 90 points

Part Number: INA901-SP
Other Parts Discussed in Thread: CS-AMPLIFIER-ERROR-TOOL,

Tool/software:

Hi Folks

Datasheet claims a Total output error of +/-3 [%]. With the remark that "Total output error includes effects of gain error and VOS". I was wondering

- if the offset drift (2.5uV/°C) is also included.

- if a gain drift of 50ppm/°C or 150ppm/°C* is also included.

- do we need to add all bias related error to the 3%?

If we need a Worst Case (NOT an RSS Error) calculation  for an operating temperature range  from -30...+50°C  can we use the stated min/max values for VOS, CMRR, PSRR, BIAS and GAIN?

Best Regard 

Rolf

* I found these Values in your Spreadsheet "CS-AMPLIFIER-ERROR-TOOL"

  • 0
    TI__Genius 9745 points

    Hello Rolf,

    The datasheet for the INA901-SP has a subgroup note that specifies that the ±3% error applies at -55°C and 125°C. This means that it will include the drift in the specification. Any of the specifications that list subgroups [2] and [3] or subgroups [5] and [6] will be defined for the whole temperature range.

    If you are calculating the error you will have to do a separate calculation for the bias, CMRR, PSRR, shunt, gain and offset errors. Please also pay attention to the information in section 7.4.2 "Accuracy Variations as a result of Vsense and Common-Mode voltage". As this could affect your accuracy. You can also check your calculations by scrolling to the right in the CS-AMPLIFIER-ERROR-TOOL to see all the error components before they are inserted into the RSS error calculation.

    Let me know if you have any more questions,

    Levi DV