Input Clock Jitter using 12Mhz clock
Anonymous
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Dec 19, 2008
12:00 AM
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Dec 19, 2008
12:00 AM
Question: What is the Input Clock Jitter using a 12Mhz Clock for EZ-USB AN2131?
Answer:
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.
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