AVR-Chat

Each has its place.

R-2R networks take much less filtering. Response speed is
faster. Parts count is higher and it may take parts with
some precision.

PWM is (often) low parts count UNLESS you try to
reconstruct signals that are too close to the PWM
repetition frequency. Then, you can need multiple-pole
filters that require op-amps or more.

Jim



On Sun, 8 Jan 2006 23:18:34 +0530
 "Anurag Chugh" <lithiumhead@msn.com> wrote:
> why only PWM?.. why not use an R2R ladder instead with
> precision resistors...
> i know they would hog a whole PORT but arent they easier
> to implement ??
> and they can do DC output values too... a simple opam in
> front (voltage follower) will boost current output too...
> 
> i am sure most people dont use R2R... but please tell me
> why?? i know there must be a reason... 
> 
> Anurag

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