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ADAU1961 differential outputs: Any common mode noise reduction opportunity?

Question asked by eingber on Apr 23, 2015
Latest reply on May 15, 2015 by DaveThib

I'm using several ADAU1961 audio codecs in a new design (with the ADAU1452 digital audio processor). My product will provide single-ended audio outputs to the user.


The design choices are to (1) use LOUTP and/or ROUTP as outputs, and leave LOUTN and ROUTN unconnected, as suggested in the data sheet, or (2) [my question] take the P and N differential outputs to a "difference amplifier" like the AD8274 to remove common mode noise on the DAC output.


Since the N outputs are generated by simply taking the P outputs and inverting them, would there be any noise reduction benefit to using a difference amplifier at the line outputs?


Thanks!

Ed

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