ADAU1462/66 S/PDIF RCA Input

Hello Max,

If you do not mind, I will refer you over to one of the best places for digital transformers and information. Look at the published papers on the web site. It has super detailed analysis. 

In my opinion you should nt have to ground the input. The transformer primary will see the difference of the signal to the remote ground so you do not and should not ground it locally. It is somewhat the point of using a transformer. 

Using a good differential input amp will be the best for good CMRR. You may not HAVE to do this, you could ground the secondary and then drive our input stage in the DSP. It would need to be cap coupled. However, read these articles and see what would be best for your application. 

Scientific Conversion, Inc. - Transformers and Inductors (scientificonversion.com)

Dave T

Hello Max,

If you do not mind, I will refer you over to one of the best places for digital transformers and information. Look at the published papers on the web site. It has super detailed analysis. 

In my opinion you should nt have to ground the input. The transformer primary will see the difference of the signal to the remote ground so you do not and should not ground it locally. It is somewhat the point of using a transformer. 

Using a good differential input amp will be the best for good CMRR. You may not HAVE to do this, you could ground the secondary and then drive our input stage in the DSP. It would need to be cap coupled. However, read these articles and see what would be best for your application. 

Scientific Conversion, Inc. - Transformers and Inductors (scientificonversion.com)

Dave T

Thanks Dave, that helped a lot.
If anyone is interested, here is my solution for my RCA S/PDIF in- and output which seems to work quite well so far.