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AN5076 - Guidelines for Selecting Reference Clock Input of the HOTLink II™ Device in Datacom Applications | Cypress Semiconductor

AN5076 - Guidelines for Selecting Reference Clock Input of the HOTLink II™ Device in Datacom Applications

Last Updated: 
Aug 24, 2015
Version: 
*B

The purpose of this application note is to analyze one of the contributors of jitter in the serial output, namely the phase noise present in the reference source. The bit-rate clock that clocks the shift register is a multiple of the reference clock. Hence, a portion of the jitter on the reference clock is transferred to the serial bit rate clock which in turn translates to jitter at the serial data output.

This document presents phase noise of nine sample crystal oscillators for which the HOTLink II(TM) serial data output meets the jitter specifications for serial output jitter.