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DDC1128: DDC1128 EVM about flux cleaning

Part Number: DDC1128

Hi support team.

My customer is evaluating DDC1128 on EVM and customer's  board.

He got a result that output data drop to zero code at low(not zero) input level on only customer's  board, but on EVM.

We think  because a flux cleaning has not been performed on customer's board. 

Therefore we have a question.

Is a flux cleaning process performed to DDC1128EVM?

I'd appreciate it if you could answer my question.

Best regards.