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AN49107 - Total System Timing and EMI Reduction Using CY254x Spread Spectrum Clock Generators | Cypress Semiconductor

AN49107 - Total System Timing and EMI Reduction Using CY254x Spread Spectrum Clock Generators

Last Updated: 
Mar 01, 2017
Version: 
*E
AN49107 describes the features and advantages of the four phase-locked loop (PLL) ICs of the CY254x clock synthesizers. It also explains the EMI noise reduction technique using the spread spectrum method.

 

Several applications require a number of independent frequencies to be generated using clock generators. Crystals and clock generators with one or two PLLs limit this requirement. Moreover traditional methods (ferrite beads, filtering, and so on.) are followed for EMI reduction with compromise in design time and accuracy. These limitations and issues are overcome by using Cypress CY254XX and CY254X series.