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AMC3330: Analog input voltage limits

ABHINAND M S
Prodigy 65 points
Part Number: AMC3330

Tool/software:

Hello Expert, I am working with isolation amplifier for the first time. I was checking if my common mode voltage levels are well within the specified limits. If my understanding is right the attached image says 3 cases of Vinp and Vinn. What if my Vinp and Vinn is not as per any of these cases. Lets say Vinp-Vinn<1 or Vinp-Vinn>1.25. How do i use this data for my requirement? 

Below is the minimum, typical and maximum of my calculated VINP and VINN.  Fundamentally i would like to know how to use the information mentioned in data sheet for checking whether my input will cause clipping or not.

VINP V 0.40 0.47 0.57
VINN V -0.40 -0.47 -0.57
VIN V 0.80 0.94 1.14

Thanks in advance,

Abhinand

  • 0
    TI__Expert 5150 points

    Hi Abhinand,

    The common mode input voltage would be (VINP-VINN)/2.  So, assuming HGND is at 0V, Your VINP&VINN values listed above wouldn't violate any common mode input voltage conditions (Vcm is 0 for the 3 listed cases).

    For the input range of the device, there are 2 ranges specified.  The linear input range (+-1V) is what you should limit your input signal to for best performance.  Between 1V and 1.25V, you would be in the non-linear range of the input and performance may be lower.  1.25V is the max voltage the input can have before the output starts clipping.

    In your above cases, when VIN is 1.14V your output won't be clipped, but the accuracy won't be the same as when the input is in the linear range.

    Thanks.