[sdiy] Choosing a DAC

[Jerry Gray-Eskue]

Good Point.

I was referring to the voltage scaling matching the desired values, using
the standard setups you have a mismatch in the step size and desired voltage
and so need the extra resolution.

If you add a stage to correct the scaling it is true that you could use the
minimum count for your desired number of steps although hardware delays on
very short counts could might make the voltage output non linear, and some
PWM hardware implementations may not allow or function at very small
periods. Still it may work fine, the acid test is to give it a go using real
hardware.




-----Original Message-----
From: Ingo Debus [mailto:igg.debus at t-online.de]
Sent: Tuesday, July 07, 2009 2:51 PM
To: Jerry Gray-Eskue
Cc: Synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Choosing a DAC



Am 29.06.2009 um 21:37 schrieb Jerry Gray-Eskue:

> Good accuracy requires a long count period to adjust the duty cycle
> in.

Why?
I do see that high resolution requires a long count period.

Yes, clock jitter would contribute less to the error when count
period is longer. But I don't think that matters much here.

Ingo