[sdiy] Switched Cap Filters

[John L Marshall]

You may want to look at AN-779.

http://www.national.com/pf/LM/LMF100.html

Take care,
John

Pacific Northwest Synth Meeting September 25, 2004
----- Original Message ----- 
From: "Tom Arnold" <xyzzy at sysabend.org>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, April 15, 2005 2:34 PM
Subject: [sdiy] Switched Cap Filters


>I dont suppose anyone has the National Semiconductore Switched Cap Filter
> Handbook do they?  At least to get a publication number or something so I
> can try and order a copy from National.
>
> I'm trying to get a pair of LMF100's to behave as a 7th order Elliptical
> lowpass, which they should do in theory but I've been unable to make work,
> and the app notes I have say that there's a schematic to do exactly what I
> want, in the Handbook...
>
> Yeah, I know, Switched Cap Filters have their own flavor of suckiness, but
> for this particular application they're perfect.  Just dont get quite 
> steep
> enough a rolloff with a single chip ( anti-alias filter ).
>
> Thanks.
>
> -- 
> -----------------------------------------------------------------
> - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
> - SynthGeek        -
> - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
> - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
> --------------------
>