Be aware that the 4311 has poor performance when used for gain; for=20 attenuation it is pretty OK. Had to toss a whole otherwise fully=20 functional design because of this; everything worked, but unacceptable=20 noise when gain was more than a few dB on a low-level signal. As I=20 recall (this was more than 5 years ago) the datasheet (at that time=20 anyway) was vague/dodgy on performance at various gain levels. The OP specified attenuation so I second the recommendation for the 4311. CHeers, J Lyle Hazelwood wrote: > On Wed, Dec 29, 2010 at 1:05 AM, Bob Blick wrote: >> I'm in need of an audio attenuator (logarithmic digital potentiometer) >> IC for occasional home projects. Nothing audiophile-grade, although that >> would be a plus if it weren't too pricey. > > I'm a fan of the PGA2311/PGA4311 chips, though they are a bit expensive. > >> I need stereo, 1 db or better steps with 60 db or more range, two or >> three-wire control, readable as well as writeable, volatile memory. > > All that is covered, with 1/2 dB steps from -95.5 to +31.5dB. > The 2311 has 2 channels, the 4311 has 4 channels. > >> If anyone has a favorite part, please let me know. > > You can find some info on one of my projects here: > http://www.midibox.org/dokuwiki/doku.php?id=3Dmidiboxmixer > I would be happy to provide any information or code that might help. > > LyleHaze --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .