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INA240: Settling time

TonyMCC
Intellectual 780 points

Part Number: INA240

Please explain the discrepancy between the INA240 settling time differences seen when comparing figure 21 and figure 37 in INA240 datasheet...?

Figure 21 indicates 90V step settle in < 2uS but figure 37 shows 24V step settle time is about  20mS

Thanks.

  • 0
    Guru 140200 points

    Hi Tony,

    why wanting to compare these two figures? They are based on totally different measuring conditions :-)

    Figure 21 shall demonstrate the response of INA240 when a high voltage common mode pulse with a fast edge is given to the inputs of INA240 with the inputs shorted together at the same time. The output signal deviation from +2.5V should be zero for an ideal INA240.

    Figure 37, on the other hand, shows the wanted output signal coming from the turn-on current of a solenoid in the presence of a high common mode voltage. The much bigger time constant on the x-axis simply results from the fact that the solenoid current is very slowly rising because of its intrinsic inductance.

    So these two figures don't contradict to each other at all. They just show two very different measuring conditions.

    Kai

  • 0 in reply to kai klaas69
    TI__Mastermind 36510 points

    Hi Tony,

    Please refer to Kai’s reply above, he explained well. Let us know if you have further questions on this.

    Thank you Kai for the quick answer.

    Regards, Guang