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INA282 Start-up Transient Response

Mohamed Hellal
Intellectual 2285 points

Hello,

Can you please explain why do we get this type of transient response please ?Page 10 of the datasheet, figure 20.

If Vin+ = 0V, will the transient response be different ?

Thanks! Mohamed

  • 0
    TI__Mastermind 27560 points

    Hello Mohamed,

    The figure quoted shows output versus supply voltage, under the condition of a fixed differential input of 50mV. The transients are due to a combination of (1) low supply condition and (2) the switched capacitor architecture (SC) of the input stage of the amplifier. When supply is low (<2.7V), not every component of the internal circuit is fully functioning. In addition, the SC circuit takes at least a clock cycle to accurately sample the input voltage. Once the input is correctly sampled then the output slews to final value of 2.5V

    By “Vin+=0V” do you mean the differential input equals 0V? If so I would not expect this kind of transient, the output should be around 0V(limited by SWING)

    Regards,

    Guang-Apps Current Sensing Products