zygot Posted February 12, 2018 Share Posted February 12, 2018 21 hours ago, xc6lx45 said: Here is some experimental data. It's completely taken with "on-board tools" using the XADC, no external filtering. Anybody can repeat the experiment with a patch cable. So the analysis accompanying the quote above implies one thing and this quote: 21 hours ago, xc6lx45 said: First, any DAC requires a reconstruction filter (lowpass) implies something different. I'm just trying to get you to discuss what I think that you should have mentioned from the start. So connecting your "DAC" output to a low bandwidth high input impedance ADC appears to perform one way. Connecting the same pin to any random load might appear to perform quite differently. No doubt you are aware of the discussion on using the PMODAMP2 using a similar approach on a different thread. In that case the relevant reconstruction filter and low impedance driver are included in the design. I just think that if you are presenting something for an undefined purpose you should discuss the relevant issues. I'm not one to throw a pocket knife into a crib and say "have fun kid.. and don't hurt yourself" Of course had you not added the "analog" function generator feature to your tool there would not have been much discussion. Anyone who has had to select a commercial DAC or ADC for a particular purpose has been introduced to the kinds of games that vendors play to sell product that might not be appropriate for that purpose. BTW, my idea of a project for this particular forum is one that the user can modify and learn something from... but the rules aren't clearly stated and there isn't a place for something like this.. Link to comment Share on other sites More sharing options...
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