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AMC1311C-Q1: Calculate VOUTP and VOUTN tolerance

TI-CSC
Genius 12885 points
Part Number: AMC1311C-Q1
Other Parts Discussed in Thread: AMC1311

Hello E2E Experts,

Good day.

Could you tell me how to calculate the VOUTP and VOUTN tolerance with all tolerance factors such as Vos,Iib,Eg,TCEg.

AMC1311x-Q1 High-Impedance, 2-V Input, Reinforced Isolated Amplifiers datasheet (Rev. B) (ti.com)

I think there is something wrong with the datasheet.

The gain of AMC1311x-Q1 is 1.0.
Vin is 2V.
So the typical Vout I think is 2*1.0=2.
But the gain error at 25deg is 2%,
If I want to calculate the gain at 125deg with gain error drift and Nonlinearity data, how to calculate it?
Are there other parameters to calculate it?

Thank you for the usual support.

Regards,

CSC

  • 0
    TI__Guru**** 180831 points

    Hi CSC,

    It's probably easiest for you to just point the customer to the Isolated Amplifier Voltage Sensing Calculator that can be used with the AMC1311.

  • 0 in reply to Tom Hendrick
    TI__Genius 12885 points

    Hello Tom,

    The customer wants to know how to calculate the GAIN at any temperature. Do we have any solution for this?

    Thank you for your usual support.

    Kind Regards,

    Jonard Rico
    Texas Instruments Customer Support

  • 0 in reply to TI-CSC
    TI__Guru**** 180831 points

    Hi Jonard,

    Let's start with page 9 under the ANALOG OUTPUT section.  The typical gain error shown in that table is also reflected in Figures 17 and 18 on page 15.  Please note that the MIN/MAX values from page 9 are guard band limits and the traces in Figures 17 and 18 show actual characterization data.  These are both listed as percentage values and they include gain error drift.  Gain error drift is expressed as PPM, so the typical +/-30 for the non B device would be 3000ppm over 100` which is +/-0.3%.  So to calculate the typical gain error at any temperature, use the delta T from 25`, multiply that by 30ppm, convert ppm to % and add that to the typical gain error.

  • 0 in reply to Tom Hendrick
    TI__Genius 12885 points

    Hello Tom,

    If I used AMC1311B-Q1,the MAX error is 0.2%.And if I used at 100deg,the delta T is 75deg.So the MAX Gain error drift is 40ppm*75=3m=0.3% ?
    And the Gain error is 0.2+0.3=0.5% is it right?
    What are Nonlinearity, Nonlinearity drift, and Output noise mean?
    Should I consider it?

    Thank you for your usual help.

    Regards,

    CSC

  • +1 in reply to TI-CSC
    TI__Guru**** 180831 points

    Not quite CSC,

    The AMC1311B-Q1 MAX gain error drift is 40ppm, so worst case would be to take the initial error and add 40 ppm to that, 45ppm is 0.0045%.  Add that to the typical and you have 0.0545%.  The MAX gain error is +/-0.2%, so those are the limit boundaries, you would not add additional errors to those.  Linearity curves are shown on page 16.  Nonlinearity is when a change on the output is not proportional to change at the input.   Output noise is just the inherent modulator and thermal noise.  These are minor contributors to accuracy.