ADuM3481 multichannel interface

Question

Hi, 
 In my circuit i have 4 ADC's all are isolated from CPU and between each, i used isolated supply for each one and ADuM3481 for isolate SPI lines, from main CPU all 4 ADC's are sharing same DIN, DOUT, Clock lines and separate CS, only one ADC is active at particular time, in this case my DIN(Input to CPU ) is pulled low by other unused ADC's 
 Please any one help me how to solve this issue 
 Thanks in advance

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ADuM3481 multichannel interface