Marcel Birthelmer wrote: > Martin and Alan, > thanks for your responses. > > To clarify, what I'm looking for is an ADC module (a development board), not > just a chip - that is, something that takes care of power supply etc, and > just provides interfaces for the analog and digital I/O. > The application is an AM radio, so I'd like to be able to receive at least > 600-1000kHz signals. This creates a lower bound of about 2MSPS. > > I saw that TI has some development boards starting around $99 with chips > that would meet my criteria, so I may get one of those in the next few days. > > Regards, > - Marcel What's your front-end look like? You can't just feed an antenna into an ADC and expect to get a good signal (or any).. I'm not an RF guru but you at least need an input filter (band-pass) and maybe (maybe, it's a modern idea) - just a first-stage amplifier if you're going for direct conversion. I'm not sure if this works the same for AM. I'm not an RF wizard. Normally, an RF amplifier has a local oscillator (or two) that gets mixed with the input signal. A low pass filter then removes the high frequency parts so you're left with audio-range frequencies. You'd then only have to sample at something like 48kHz. If I were you I'd first work on how you're going to receive the RF in the first place. Get an ARRL Handbook and also read about the "SoftRock-40" project. - Martin -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist