Digital controlled filter.

[John Speth]

Maxim (and others) makes serial controlled DACs which would make a nice front end for control of any curtis chip you'd like.  This is a 2 chip solution not counting the glue.  In fact serial controlled DACs seem to be the norm for new designs.

John Speth
Object Engineering, Inc
mailto:johns at oei.com
 

> -----Original Message-----
> From: owner-synth-diy at mailhost.bpa.nl
> [mailto:owner-synth-diy at mailhost.bpa.nl]On Behalf Of The Dark force of
> dance
> Sent: Saturday, February 20, 1999 4:37 PM
> To: DIY
> Subject: Digital controlled filter.
> 
> 
> Y-ellow Y'all.
> 	Anyone know of a readily available digitally controlled 
> filter. I was
> hoping for a VCF type filter which can be run in band-pass and Low-pass
> modes but was controlled by a serial digital input. I2C/microwire/etc. I
> spoze I could mess round with an Switched Cap filter or something (If I
> could get a suitable one) but I just wanna do this quickly, 
> simply and very
> very small. I need to whack it on the end of a micro obviously.
> 
> What I need is something like a curtis chip with a serial digital input. I
> know it's unlikely but is there anything like that out there these days?