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How to select clock for PHY whether Internal clock or External clock?

Latest Updated:09/28/2009

Question:

The Clock for PHY is selectable whether Internal clock or External clock. How to decide the selection ?

Answer:

Jitters of the differential transmit output pins (TxP and TxM) depend on the jitter of the original clock. Thus, they can be reduced by using an external clock if its jitter characteristic is better. Please note that if the jitter characteristic of the original clock is not good, it may cause frequent False Carriers.
Suitable Products
SH7619
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