[sdiy] SSI2164

[Mattias Rickardsson]

On 14 March 2018 at 20:27, Michael Grossman <mgrossm1 at yahoo.com> wrote:
>
> Beyond analyzing the datasheet has anyone done an evaluation of the
SSI2164 chip?

On 14 March 2018 at 21:35, Mattias Rickardsson <mr at analogue.org> wrote:
>
> I'm already seeing some lower noise and lower THD with the SSI compared
to the Coolaudio part. I'm also having a misbehaving SVF, but as I managed
to ruin some solder pads when switching ICs, I think I'm the failing bit
here. Something must have ended up wrong... I hope. The quest continues.

I've corrected my mistakes and can indeed see a similar increase in SNR in
a SVF, particularly in the passband and around the cutoff frequency for all
filter responses.

As a drop-in replacement the improvement is only a lower THD, but the key
to lower noise is that the SSI2164 tolerates louder signal currents than
SSM2164 & V2164, and the impedances around the VCAs can be redimensioned in
order to exploit this.

/mr
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