Generating accurate High Frequency Clock for PSoC 3

Question: How can I generate most accurate clock at high frequencies in PSoC 3?

 

Answer:     

  

 

To get the most accurate clock at higher frequencies, one should use IMO at 3MHz as it is most accurate at this frequency (1% error). Then PLL should be used to increase the frequency to a desired higher value to get maximum accuracy of clock at higher frequencies.

 

The use of IMO at higher frequencies reduces the accuracy of IMO (7% error at 62.6 MHz). Therefore, lower frequency IMO and PLL combination is best suited for accurate high frequency generation.