VCA chips

[List, Christopher]

Hi Don - 

Yes, I've played with the 2164, and it is a nice chip, but it is
significantly different from the 2024. The biggest difference being the
fact that it is controlled exponentially by a voltage rather than
linearly by a current. Far from a "drop in replacement". 

Other than that, I'm not sure what kind of info you're looking for...

Last time I checked, Newark was still selling 2024's, so I picked up
about 10 of 'em for safe keeping...

C.List
chris.list at sc.siemens.com

> -----Original Message-----
> From:	Don Tillman [SMTP:don at till.com]
> Sent:	Tuesday, August 25, 1998 12:30 PM
> To:	synth-diy at mailhost.bpa.nl; jhaible at metronet.de
> Subject:	VCA chips
> 
> Hiya.
> 
> JH's interpolating scanner work inspired me to come up with some
> designs of my own, and I'm writing up an article about them that I'll
> be posting soon.
> 
> And so... I've been looking at the VCA issue.  JH uses SSM2024's,
> clearly a good choice for hifi reasons, but it appears from the Analog
> Devices web site (http://www.analog.com) that these are no longer in
> production and a newer chip called the SSM2164 is the one to use.
> Okay fine; and look, the data sheet for the SSM2164 mentions that you
> they're designed to replace the SSM2024 with minimal circuit changes.
> Cool...
> 
> Except they fail to mention that the polarity of the control input is
> inverted.  
> 
> Before I phone Analog Devices, does anybody have any insight
> recommendations on this?  Any experience with the 2164?
> 
>   -- Don
> 
> 
> 
> 
>