[sdiy] Choosing a DAC

[Jerry Gray-Eskue]

Good accuracy requires a long count period to adjust the duty cycle in. By
the time you add a filter ( and its time constants) to get a solid DC level
PWM is very slow compared to other DAC types. Depending on your PWM clock
speed and what you are using it for, it MAY be fast enough for satisfaction
performance.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of David Anderson
Sent: Tuesday, July 07, 2009 12:12 PM
To: Synth DIY
Subject: Re: [sdiy] Choosing a DAC




Ingo Debus wrote:
> Can you use a PWM-based DAC? This would be very accurate, and since you
> only need 8 bits (or even less) it would surely be fast enough.
>
> I'm not an AVR guy, but many microcontrollers have some PWM output
> already on chip.

And here's an example of converting PWM output to a 0-10v range. There's
a circuit Melanie's reply:
http://www.picbasic.co.uk/forum/showthread.php?t=245

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