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INA296A: Output Accuracy

McKenna Strambi
Intellectual 2440 points

Part Number: INA296A

Tool/software:

Hello expert,

Could you help me understand how the input offset voltage affects output accuracy? The datasheet specifies a maximum value of ±15 µV—does this remain consistent over time, or does it vary?
If it does change over time, my understanding is that it could introduce up to 0.6 mV of noise in the output voltage. Could you confirm if this assumption is correct?

Thank you!

McKenna

  • 0
    TI__Expert 7950 points

    Hi Mckenna,

    If you are operating at the conditions specified in the datasheet , , then the offset voltage at the output will just be the offset voltage listed in the datasheet times the gain of the device.

    Ex. A1 version, VOS = ±5uV, Gain = 10V/V --> the offset voltage at the output = 5uV * 10V/V = 50uV

    However, if you are operating at a different Vs or VCM than what is listed you will need to take the PSRR and CMRR into account.

    For further help here is an error calculator tool you can download and use: https://www.ti.com/tool/download/CS-AMPLIFIER-ERROR-TOOL 

    Best,

    Holly