16F series figure 40uS per channel. If you are just doing one channel you can shave some off the track-and-hold time. That's just off the top of my head, the datasheet has better numbers but takes some headscratching to sort out all the phases of the conversion process. Cheers, Bob solarwind wrote: > Also, what is the maximum sampling frequency that the PIC can do? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist