Input Clock Jitter using 12Mhz clock

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    Question: What is the Input Clock Jitter using a 12Mhz Clock for EZ-USB AN2131?



    The data jitter depends on more than just the crystal jitter. Using a 12 MHz crystal with a tolerance of ±0.25 % has been measured in some designs to have a jitter of -0.3 nsec to 0.2 nsec. This measurement was made with a 1.5 meter USB cable. The same design on a 5-meter USB cable has had a ±0.5 nsec jitter.  AN2131 requires a clock with less than ±0.25% tolerance to meet the USB data jitter requirements.