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Choose Your ADC Averaging Method With Care… | サイプレス セミコンダクタ

Choose Your ADC Averaging Method With Care…

Last week my friend Kendall Castor-Perry published an interesting article on multi-channel ADC averaging methods on Product Design and Development ( In it he discusses the options that modern integrated ADC technology gives you for optimizing conversion rate when scanning multiple channels, including the case where some channels are averaged and some are not.

The traditional method - known as sequential averaging - is to scan each channel multiple times until the averaging is complete, then move onto the next channel to repeat the process. And so on for all channels. For a given channel this results in a long delay between usable samples while the ADC scans other data. This "aperture" limits the maximum frequency that can be reliably scanned courtesy of our Swedish chum Nyquist. And the limit frequency is highly dependent on the other channels being scanned.

CY3295 Kit Image

With the alternative method - interleaved averaging - the ADC samples each channel just once and then moves onto the next one. This repeats until the averaging is complete and can be read from the ADC. This averaging method does not suffer from the same sampling rate limitations because the samples are all taken at even intervals, rather than in bursts. Adding channels to the ADC configuration slows the overall scan rate a little but does not create the troublesome profile of bursts of samples followed by an aperture.

CY3295 Kit Image

Kendall goes into a lot more detail than I can here. Well, to be more honest, he goes into more detail than I can regardless of where I am or who I am talking to! He touches on the limitations of ADCs with a single result register (as opposed to a register for every channel) and also discusses aliasing issues and their impact on sample frequencies. It's all good stuff and nicely explained so I definitely recommend giving the article a read.



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allisonblair67_2798091's picture

Well, it’s good to know that you know your limits but Kendall to be reaching this far on ADC technologies is a rare stuff, not every developer or expert could reach far and make a report like that. She must have gathered all the Dissertation Help UK knowledge and make her use it in the right directions.

leesharleen075_2812026's picture

That was an interesting read. I also read the kendal article and you are right he does go into great depth. I was working as in a web designing company and we needed to work with electrical engineers at one point. It was a great time. 

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joesimon817_2942771's picture

Good stuff!


merlinjohn098_2861591's picture

Several multichannel ADC averaging methods or techniques are now available and many of them are known to us too. This one you have shared here is good and I appreciate the great brain behind this. Thank you for this well researched article and keep your work! print spooler service not running

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