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AMC0330R: Misleading Vout calculation information

Z. LI
Prodigy 80 points

Part Number: AMC0330R

In 7.3.3 Vout formula is listed as:

image.png

But there is also a figure that says Vout = 0.9*VREF when VIN=VFSR, these 2 information doesn't add up.

image.png

 

Take VREF=3V; VIN=1V as example, with the formula we got Vout = 1/1.28*1.5+1.5 = 2.67V, with the figure we got Vout = 0.9*3 = 2.7V

 

Either the formula didn't take non-linearity into account or the figure is wrong. The formula of this figure in linear zone is in fact:

VOUT = VIN/VFSR*(90%-10%)*VREFIN/2+VREFIN/2

 

  • +1
    TI__Expert 4701 points

    Hello, I discussed this topic with our systems engineer responsible for the datasheet. He acknowledged that the graphics is not exactly matching the formula as the levels should be 11 and 89%. Please refer to the provided formula in the datasheet that is correct.

    Kind regards, Jiri Panacek