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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

I have some questions regarding the CY8C58 series PSoC and analog performance.

   

The datasheet claims up to 20 bits resolution on the delta-sigma ADC. Are there any real-world tests to verify that this level of accuracy is actually achievable? The internal reference is 1.024V, which at 20 bits gives 1uV/count. Given that you can route any pin to any function there is potential for both digital noise and analog noise to get coupled into the analog signal to be measured.

   

I expect to actually get 20 bits of resolution differential signalling will be required and that the PSoC would have to be quiesced for the duration of the measurement. Is there example code from Cypress which demonstrates how to perform such an accurate ADC measurement? Are there any other tricks or design philosophies which need to be followed to achieve this level of accuracy with the internal delta-sigma ADC?

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1 Solution
ETRO_SSN583
Esteemed Contributor

Sorry, first link I supplied was in Japanese, here corrected -

   

 

   

    

   

          

   

http://www.cypress.com/?docID=43509     AN57821

   

http://www.cypress.com/?rID=40247          AM58827

   

http://www.cypress.com/?rID=39974          AN58304

   

 

   

 

   

    

   

          

   

http://www.cypress.com/?rID=51577           PSOC 5LP DVK, discusses noise floor considerations

   

 

   

Regards, Dana.

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ETRO_SSN583
Esteemed Contributor

These might assist you -

   

 

   

    

   

          

   

http://www.cypress.com/?rID=39677     AN57821

   

http://www.cypress.com/?rID=40247     AM58827

   

http://www.cypress.com/?rID=39974     AN58304

   

 

   

 

   

Regards, Dana.

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ETRO_SSN583
Esteemed Contributor

Sorry, first link I supplied was in Japanese, here corrected -

   

 

   

    

   

          

   

http://www.cypress.com/?docID=43509     AN57821

   

http://www.cypress.com/?rID=40247          AM58827

   

http://www.cypress.com/?rID=39974          AN58304

   

 

   

 

   

    

   

          

   

http://www.cypress.com/?rID=51577           PSOC 5LP DVK, discusses noise floor considerations

   

 

   

Regards, Dana.

View solution in original post

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Anonymous
Not applicable

 Thank you very much, I will review these documents and see what I can figure out.

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