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About AD7328 ADC misuse

Category: Hardware
Product Number: AD7328

Dear Responsible,

In my research project i used AD7328 ADC in order to readout unipolar analog signals.

SPI digital communication was isolated by using ADUM3481.

During prototyping i noticed that digital isolator was broken. After a long search period i found my mistake that "VSS" pin of ADC was floating, instead of direct ground connection, as given in the below schematic picture.

but i could not understand why digital isolator was failed instead of ADC? In AD7328 datasheet i could not see any detailed internal structure to tie up this failure to my mistake.

Could you pls explain me how my mistake could reason digital isolator failure?

Best regards

Ezgi