[sdiy] Appearance of many SSM2300 chips

[Veronica Merryfield]

On 2011-05-28, at 11:34 PM, Andre Majorel wrote:

> What's in an N-channel DAC ? Is it N DACs or 1 DAC and an N-to-1
> demultiplexer ?

Both exist and both seem to be classed as N channel although the Digikey parametric filtering sometime distinguishes the difference but not consistently. 

> If the VCOs of a polyphonic synth are driven by
> different DACs, the conversion errors will sometimes add up.

This is where an understanding of DAC errors comes in.

> It's not like the equal temperament scale is too much in tune to
> begin with...

That comment has tangentially got me wondering if anyone here is using or has used a DAC to drive a VCO without a lin->log convertor? Whilst a good 12 bit DAC with a lin->log convertor should be good for 10 octaves and a 3 cent resolution, a 12 bit DAC hasn't enough range for a direct log drive. I don't think a 16 bit device has either.