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RE: A/D Capabililty — Parallax Forums

RE: A/D Capabililty

schwiegjcschwiegjc Posts: 41
edited 2008-10-15 19:57 in Propeller 1
I recently ran the microphone_to_speaker code and was amazed that it worked (via simple assembly code). I thought that one had to have an A/D Chip and DAC to captured and output·analog signals. Having to·use·interfaces chips reduces the sampling rate. Is there a simple·answer that explains how it works? I have a need to sample/output analog voltages. Eliminating the need of A/D and DAC would make the design·easier to implement.··

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2008-10-15 19:57
    Look at the Wikipedia article on Sigma-Delta A/D conversion. I think Dallas Semiconductor and Analog Devices have nice application notes on this technique and how it works. I don't have any handy links though.

    Get Parallax's application note (AN001) for the Propeller counters. There's an object included for A/D conversion and the comments describe how to use it. Look at www.emesystems.com and click on "app-note" for a discussion of A/D and D/A conversion using a Stamp. It's slower than the Propeller's, but uses essentially the same techniques.
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