On 2006-04-11, Coyoteboy wrote:
I'm looking to use the PWM outputs from my IC to produce an analogue value
using an RC network. Unfortunately everywhere I've found in searching only
gives calculations for if i want analogue waveforms, not flat constant (as
possible) outputs. Is this going to be a trial and error thing where RC
sizes are systematically swapped or is there a known method of
approximating? I can alter my PWM frequency (and obviously duty) as needed.

DC is just extremely low frequency AC...

you won't get flat DC with an RC network. but you can get arbitrarily low
ripple. how low do you need it and what settling time can you accept when
changing levels...

Bye.
Jasen