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AMC1100 / calculation of accuracy

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: AMC1100

Hello,

(1) about Nonlinerarity
Since Nonlinearity is +/-0.015% , should we consider ±0.6mV as output voltage difference by nonlinearity at the condition of Vdiff=±250mV, Gain=8 , Vout = ±2V? 

(2) dc voltage mesurement accuracy
Could you please let me know the caliculation of output voltage which include Vos, Vos drift, noise , nonlinearity, gain drift or other parameters for accuracy?
If there are the calculation example, please let me know.

Best Regards,
Ryuji Asaka

  • 0
    TI__Genius 9975 points

    Hello Ryuji-san,

    (1)    Yes, your nonlinearity calculation is correct.

    (2)    For accuracy of DC voltage measurements: Vos, nonlinearity and gain error play a role; noise does not play a role in accuracy for DC measurements.

    Assuming VDD2 = 5 V, and for the temperature range between -40 deg . C and 105 deg. C, the absolute maximum DC deviation on the output is 55 mV. Note however that this is expected to occur only on 1 out of 125 million units. The occurrence rate is expected to be this low because the likelihood of the three events occurring at the same time is low (the probability of observing a maximum in any of the offset, gain error and nonlinearity errors is about 0.2 %).

    At 25 degrees C and VDD2 = 5 V, about 33 % of AMC1100 devices produced will exhibit a total DC output deviation between 2.7 mV and 55 mV; the other 66 % of devices should exhibit total DC output deviations of less than 2.7 mV.

    Absolute maximum DC deviation = sum of maximum gain error, nonlinearity and offset.

    At 25 degrees C, the typical deviation is the square root of the sum of the typical squared errors.

    Hope this helps.

    Best regards,

    Jose

  • 0 in reply to Jose Duenas
    Guru 20090 points
    Hello Jose san,

    Thank you very much for your reply.
    I understood.
    I got the new question from the customer.
    Since the information has our customer cofidential, I will send the e-mail directly to you.

    Best Regards,
    Ryuji Asaka