Do the input current of AD7091 Vin0 ... Vin7 ,and REF IN /REF OUT and ADC IN pin need to be constrained blow a vlue ?

Question1:     Do the  input current of AD7091 Vin0 ... Vin7 ,and  REF IN /REF OUT and ADC IN  pin need to be constrained blow a vlue ? or will the chip be destoried?

Question2:     What is the function of ADC IN  pin and MUX OUT pin ? Via the information in the datasheet ,I can not  learn that clearly

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