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Projects => IC-based Overdrive => Topic started by: mark123 on August 09, 2016, 07:56:09 AM

Title: SCPA designation
Post by: mark123 on August 09, 2016, 07:56:09 AM

There are a number of chips that carry the SCPA designation at the end such as ICL7660SCPA.  What does it tell me?  I was told that using one as a charge pump in an audio situation that I'd need the SCPA or I'd risk getting a high pitched whine at the output.  I never questioned it and always went with the SCPA version. 

Any idea what it means?

Title: Re: SCPA designation
Post by: bluebunny on August 09, 2016, 08:02:10 AM

In this particular case, it's the "S" that tells you the chip is capable of being wired up so that you avoid the whine (short pins 1 and 8).  The other letters will tell you about packaging and other specs, none of which is whine-related and none of which will kill anyone.  So not important.   ;)

Title: Re: SCPA designation
Post by: mark123 on August 10, 2016, 07:30:11 AM

Thanks for the info. :)

Best regards.

Title: Re: SCPA designation
Post by: bluebunny on August 10, 2016, 09:33:38 AM

You're welcome.  (And welcome, too!)  BTW, you might want to post in the main "Building your own stompbox (http://www.diystompboxes.com/smfforum/index.php?board=2.0)" forum.  There's very little footfall on this project sub-board.   :)

Title: Re: SCPA designation
Post by: mark123 on August 10, 2016, 03:35:29 PM

Ah, sorry for the noob mistake.  I'll figure out where to post one day. :)

Thanks so much for the assistance.