Re: Inverting vs. Non-Inverting input for audio?



John Larkin wrote:

"MRW" <mr.whatever@xxxxxxxxx> wrote:

Someone sent me a link to Maxim's Audio Seminar where they claim that I
can learn stuff not found in the textbooks. Anyway, I somehow found out
about the new MAX9722 with DirectDrive. This caught my eye because it
said that I can eliminate huge DC blocking capacitors. Here is a link
to the data***:

http://datasheets.maxim-ic.com/en/ds/MAX9722-MAX9722B.pdf

I noticed that most of the circuits they have on the data*** uses
inverting input as the main input. I'm just curious why. Is there a
sound quality difference between inverting and non-inverting?

I would assume that the non-inverting option would be use so the signal
stays in phase. But again, I don't know too much about audio yet.
Thanks!

Was it Jim Williams who said "always invert"? Inverting results in
lower distortion because it eliminates common-mode-rejection errors,
which can be bad even in mega-gain opamps.

I'd like to see justification for that assertion wrt modern opamps.


Graham

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