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INA197 - Distribution chart for offset voltage

Guru 19775 points
Other Parts Discussed in Thread: INA197

Hello Team,

I think it would be difficult, however, is it possible to share the Vos distribution chart for INA197 ?

Thanks in advance.

Best Regards,

Kawai

  • Hello Kawai,
    Sorry, we don't have the distribution data. But it is specified in the electrical characteristics table. It is typically around 0.5mV or a maximum of 2mV at room per the spec table conditions.
  • Hello Rabab-san,

    Please allow me to ask you additional questions.

    [Q1]
    I am understanding the offset voltage TYP value is +/- 0.5mV at TA=25C, for MAX the it says "2mV" in the datasheet electrical characteristics.
    Does this "2mV" mean +/- 2mV ?

    [Q2]
    For Vos at TA=-40C to +125C, datasheet only have positive value (no negative sign).
    Is Vos(TYP)=+/-0.5mV, Vos(MAX)=+/-3mV for over temp ?
    What is the worst value for Vos + and - ?

    [Q3]
    Our customer requests us for the distribution data. Is it possible for you to take the data of Vos for N=10 samples from different lots ?

    Best Regards,
    Kawai

  • Hello Kawai,
    1 and 2. Negative offset will not matter as this is a unidirectional device and device is limited by the negative supply swing.
    3. We have the maximum specification for offset in the datasheet that guarantees that the device vos will not exceed that.
  • Hello Rabab-san,

    Thank you for your support.

    [1 and 2]
    How about when shunt voltage is measuring 3mV ? I think negative offset voltage would affect the monitoring current.
    Vos=+3mV --> (3mV+3mV) x50 = +300mV
    Vos=-3mV --> (3mV-3mV) x50 = 0mV

    We would like to calculate the current monitoring accuracy. Could you provide us the maximum negative offset voltage information ?

    * I understood that if the calculation results to negative voltage, you could ignore it and calculate as 0mV.

    Best Regards,
    Kawai