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AMC1100: Nonlinear performance

Part Number: AMC1100

Hello Guys,

Good day.

Our customer have built-up a PCB design using AMC1100. The unit is perfectly linear for a portion of input voltages and then at a certain point it goes non-linear.
They made sure to follow the design guidelines specified on the the datasheet: They have made two separate power rails that are separated from each other on the board, have used RC filters both at the differential input and output. 

Is this a known issue with AMC1100?

Your inputs are highly appreciated.