[sdiy] Expo in one chip?

Neil Johnson neil.johnson71 at gmail.com
Fri Jan 5 18:16:13 CET 2018


Mattias Rickardsson wrote:
> Also, the RC value of the compensation network needs to be changed a little
> bit if you use input resistances far from the typical values, so it might be
> good to have them outside after all.

Indeed.  I asked SSI if they could provide some notes or equations in
the datasheet to use to work out compensator component values for
different input resistors.

> Actually they are a tiny bit noisier (about 1/2 to 1 dB from the data I've
> seen so far) than the V2164, but a tiny bit lower noise (again about 1/2 to
> 1 dB) than the original SSM2164 if you swap them in the same circuit. But
> the reduced distortion can allow for a lower-noise circuit design for a
> given task.

The datasets that SSI have collected show that overall the SSI2164 is
quieter than the SSM2164 in class AB mode, but a little bit noisier in
class A mode, and in both modes with much reduced distortion.  Overall
I think it's an improvement, and it looks like the spread is tighter
for the SSI part (or they chose some really good SSI parts and some
really bad SSM parts...).


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