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Is it neccesory to use galvanically isolated interface with AD5542A D/A ic?

In datasheet of AD5542A, galvanically isolated interface is being suggested to use while connecting AD5542A D/A ic with controller unit. I am giving controlling signal and data from FPGA to D/A ic. I am not having an idea of at what condition we can avoid the use of galvanic isolation if we not want to use it.plz suggest some criteria to decide.