[sdiy] Expo in one chip?

[Mattias Rickardsson]

On 26 December 2017 at 23:30, Neil Johnson <neil.johnson71 at gmail.com> wrote:

> David,
> > Can you tell us briefly what these "welcome changes" are?  I, for one,
> was
> > hoping that they'd put the stupid stability networks on the chip, saving
> a
> > pile of 560pF caps and 510R resistors.
>
> For one thing, if they did manage to put four 560p caps on the die
> then you wouldn't be able to afford it - the die area would be so
> large the simple cost plus reduction in yield would push the price way
> up, far more than the savings of external components.  So, no, you
> still need external compensation networks on each input.
>

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.


> Main improvements are: lower noise,


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.

/mr
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