-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> I am using a software implemented Sigma Delta converter in a current project >> (using a Z8 :-)) >> Using a Z8 with an internal comparator this essentially allows a converter >> to be made with a reference, one capacitor and 2 resistors. In practice I >> add 2 opamp sections before this to provide voltage gain and buffering. >> Still a cheap and accurate converter. I get about 10 bits of accuracy but >> more can be had with longer conversion times. I had a bad experience with one of these. We were stepping a motor (microstepping) and sampling, and the best we could get to was 6 bits at 7200s/s. That /12 on the xtal is a real killer. - -- Are you an ISP? Tired of spam? www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use iQA/AwUBOPjxhYFlGDz1l6VWEQL+yQCg54R6E6BqaR7GtL6xybLJ2SkjpcMAoNKi MRBl0i3cuqQjB5IA8d/0AZYB =3o2B -----END PGP SIGNATURE-----