>-----Original Message-----
>From: Roy J. Gromlich [mailto:rgromlich@PA.NET]
>Sent: 13 January 2004 13:31
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC:]18F452 100khz sampling frequency
>
>
>This is just a guess, but I think he wants to digitize the
>50KHz signal and do some processing on it.  Unfortunately, the
>rule of thumb for signal processing says that you need to
>digitize at least 2X your highest frequency of interest (100K
>samples/sec). But if you are trying to do DSP on a 50KHz
>signal you would need to digitize faster -- 3X or even 5X. The
>A/D converter is not going to run at 250K samples/sec. --- you
>need an external chip to do that. But that's not a big deal:
>12-bit 1MegaSamples/sec chips are readily available and are
>pretty cheap, even.

Getting an 18 series PIC to keep up with that data rate and actually perform
some useful processing may be a little harder however!

Mike




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