I am working at verifying an old design. Are IBIS models available for the ADAU1401 device?
I just checked and I do not see any models for this part. I also looked for the 1701 since they are very similar parts but none for that one as well. I think this part was released before we routinely commissioned IBIS models for the parts. At this point if your project is large then I can probably justify the costs to the people upstairs but then it will still be Months before the models would be available.
Let me know if you want to pursue this further. You can send me a PM