Ok, I'm at odds here. I'm building a radio telescope (a few different ones for different purposes actually) and I'm going to use an 18X to do most of the controlling. The high speed readings are going to be done over a parallel interface not involving the picaxe, but for slower (much slower) integrated readings, I'd like to skip a second "discrete" ADC as it just adds complexity, cost, and noise that I'm trying to avoid.
So...after all that...how is the stability of the ADC on the 18X. I was overlooking the microchip datasheet, and found data error information, conversion time info, etc, but nothing about the general noise stability. As in if I have 2.5 volts steady into it, how many readings out of say, 100, or 1000, would it read the same?
Also on that note, has anyone actually measured, or can toss out an educated guess, as to the tracking capability of the ADC? What kind of frequencies can I expect to get reliable results without skew during the conversion process?
Sorry if I'm asking questions that are in the datasheets or other literature, but for the life of me I could not find it! Thanks in advance for any help.
--Andy P
So...after all that...how is the stability of the ADC on the 18X. I was overlooking the microchip datasheet, and found data error information, conversion time info, etc, but nothing about the general noise stability. As in if I have 2.5 volts steady into it, how many readings out of say, 100, or 1000, would it read the same?
Also on that note, has anyone actually measured, or can toss out an educated guess, as to the tracking capability of the ADC? What kind of frequencies can I expect to get reliable results without skew during the conversion process?
Sorry if I'm asking questions that are in the datasheets or other literature, but for the life of me I could not find it! Thanks in advance for any help.
--Andy P