Heard back from FAE. Seems like there is a process change on the =20 18F's, so the spec really has changed. Sucks. But that allows for =20 quite fast acquisition times, which I don't need, so hopefully the =20 longer charge-time I'll use will still be fast enough to get the =20 sample rate I need. I need to read the specs in detail and run some =20 tests. Quoting PICdude : > Some time ago I started porting to an enhanced PIC 16F1936 to replace > 16F883's I've been using, so I could get a faster internal osc and > touch-switch capability. But there are some annoyances (bugs which > have unpleasant workarounds in the errata). But now there's a > 18F23K22 that I'm thinking I'll use instead. Same package & pinout > (so boards don't change), no banking, faster (in case I need it), and > no Vcap, so I'll get that pin back. > > However, I notice that the Zain (min recommended analog source > impedance) on the 18F is 3k, vs. 10k on the 16F. And the 18F does not > state that higher is okay with a 0.01uf cap as with the 16F. Why is > this? Did something change, or did they re-think the specs on the > same module, or...? I've been using sources with over 20k impedance > with no problems, but with a much longer sample-cap charge time. Is > there some reason I won't be able to do this with the 18F part? > > Cheers, > -Neil > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .