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ADS1278-HT: unused digital outputs

Part Number: ADS1278-HT

Hello,

In my application, I will be using TDM mode of operation and will not be utilizing the test function (TEST[1:0] connected to DGND).  Therefore, I do not need to read the values of DOUT2-DOUT8.  What is the recommendation for these unused pin?  I am assuming that these pins are driven to a known state and could be left unconnected, but I would like to have a definitive answer?

Thank you,

Brandon