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Input referred noise test question

Question asked by torontorogerscellphonetransfer on Mar 24, 2016
Latest reply on Mar 31, 2016 by rcalam

I am trying to learn more about the Input Referred Noise test as applicable to a sigma delta ADC.  I came across the application note for a ADC 7730.  How can the test below be made more stable/accurate in the context of a production test for a sigma delta ADC?  Can we add a digitial filter?  What are the common causes of instability in an IRN test for a sigma delta ADC?

 

                                                              i.      IRN test details:
A DC source is applied to the input of the Sigma-Delta ADC as a common-mode voltage bias.  Then, the ADC captures 64K points & we post process the samples to determine IRN.

                                                           

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