[sdiy] discrete DAC accuracy

[René Schmitz]

Hi again,

Fredrik Carlqvist wrote:
> My point is that I don't need absolute accuracy. I am just after a monoton
> output function when looping through the codes. If any one code is 10% off,
> I don't care, as long as it is about the right distance from it's
> neighbours.

That won't be the case.

> I will use it to control noncritical things like the VCA, LFO rate etc. The
> important thing here is to remove the 'stepping' with an 8-bit DAC. Even
> though I don't get more precision with more bits, I get improved smoothness.
> At least, this is what I hope to achieve.

No you don't. When you add bits past the accuracy of the MSB, the DAC 
becomes nonmonotoneous, the added bits are useless.

Cheers,
  René