Re: Filter to use PWM signal as DAC?
- From: Mark Jones <abuse@xxxxxxxxx>
- Date: Mon, 04 Apr 2005 16:41:16 -0400
Andrew wrote:
> My microprocessor does not have a DAC, it does, however, have a PWM
> output. I am wondering if there is a simple circuit I can use to
> convert the PWM output to an analog DC voltage. It does not need to be
> terribly accurate, a ripple of around 50mV would be good.
>
> The PWM output is 0-5V, and I can control the frequency from around
> 1kHz to around 20kHz.
>
> Can anyone tell me specifically what type of filter I need, and what
> the configuration of the filter is? Also, how to select values? I am
> willing to read on the topic if someone can point me in the right
> direction!
>
> Thanks!
>
See a graphic of a nice 4th-order passive-RC filter at:
http://groups.yahoo.com/group/jallist/files/heliosstudios/PWM2V_2.png
Also see the two-wire, serial, 8-bit DAC also at that location if speed is not
an issue. DAC4094.png
.
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