[sdiy] Choosing a DAC

[Louis van Dompselaar]

But the fact is (and that is what Tom is implying I think) that there
is plenty of synth hardware out there (including midi-cv and quantizers)
that is perfectly in tune with 5, 6 or 8-bit DACs.  So somehow even
these old DACs can keep a perfect tune.

I very much doubt a DAC can be off -1LSB on one step and +1LSB on
the next.  I think your calcations show a theoretical worste-case
error which almost none of the DACs will actually have.


Op 7 jul 2009, om 13:13 heeft Stewart Pye het volgende geschreven:

> There is still the issue of accuracy though.
> For a 12 bit DAC with an INL of  +/- 1LSB with a 5V span,  steps could
> be off by as much as 5V / 4095 * 2 =  2.4mV.
>
> The best version of the AD558 had 1/4 LSB INL. Over a 5V span the  
> error
> for that could be 5V / 256 * .25 * 2 = 9.7mV.
> Someone please correct me if I stuffed up my calculations there.
>
> I might just get a 12 bit DAC with +/- 1LSB INL and see how it  
> goes....