Burr-Brown has an Application Bulletin on turning square to sine wave.
see url:

http://focus.ti.com/lit/an/sbfa003/sbfa003.pdf

-----Original Message-----
From: moonshadow [mailto:moonshadow@NTLWORLD.COM]
Sent: Friday, June 20, 2003 2:35 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Square wave to sine wave - how?


Thanks for the reply. In the end I used an LC filter 1mH and 47n at 14 =
kHz
and that not only produced a nice sine wave but also 30 volts peak to =
peak
from a 5 volt square wave :-) ...... John

----- Original Message -----
From: "Marco Fontani" <ilithiiri@YAHOO.IT>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, June 20, 2003 6:12 AM
Subject: Re: [PIC]: Square wave to sine wave - how?


> > Is there an IC around that takes a square wave as input
>  > and outputs a sine wave?
>
> I think a capacitor will do.
>
> pic pin that
> o----------------o----------------o your sine wave
> generates        |
> square wave      =3D capacitor
>                   |
>                   X ground
>
> Obviouslly the capacitor will generate a sine wave between GND and =
Vdd.
>
> I think this will help.
> -marco-
>
> --
> Fontani Marco aka RoZe}[R]{@IRCNet & Shanks@IrcOp@IrcItalia
> Phone +393288355236 - Okram@Av3MUD - ProgrammerInSearchOfJob
> AthlonXP2000+@2100+ on K7VTA3/KT333 512MBRam 20GB+30GBHD
> Linux *h* user friendly, ma selettivo sui propri amici.
> x =3D x^y; y =3D x^y; x =3D x^y; <-=3D swap with no need for 3rd var.
>
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