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Some questions about the clock&timing products

Shawn_Wang
Expert 3811 points
Other Parts Discussed in Thread: LMK05318

Hi team

Recently, I started to learn clock&timing products to support my customer, and I need your help to solve some basic questions. Thank you.

1. What is the function of Network Synchronizers? 

"The LMK05318 is a high-performance network synchronizer clock device that provides jitter cleaning, clock generation, advanced clock monitoring, and superior hitless switching performance to meet the stringent timing requirements of communications infrastructure and industrial applications."

It seems that the network synchronizer is the high-level, rich-function product of jitter cleaner according to the description in the datasheet. Can you help briefly introduce the function of this kind of device？

2. What is the difference between the clock generator and the oscillator?

  • As far as I know, these two devices both can generate the clock signals but the generator needs an external crystal.

  • These two devices can be connected to a clock buffer to generate specific clock signals.

Look forward to your reply. Thank you.

  • 0
    TI__Mastermind 33580 points

    Hello Sidong,

    1. Network synchronizers are used to take high-precision clocks or recovered clocks from data signals, and distribute clocks at many different frequencies with equivalently low phase noise and wander. Unlike a typical jitter cleaner, where the noise of a high-jitter signal is replaced with a lower-noise VCXO, a network synchronizer expects a high-precision reference source as an input to a DPLL, and uses this to eliminate the PPM error from a lower-precision reference like a standard XO. Some examples of available network synchronizer configurations and applications are included in the supported synchronizer modes for TI network synchronizers application note. Because network synchronizers use DPLLs to track the high precision reference, many additional features become simpler to implement, such as reference input monitoring for frequency accuracy and early/missing clocks, seamless reference switching with no phase hit, averaged history tracking during holdover events, and digital control of system phase by adjusting the DPLL feedback division. 
    2. Your understanding of the difference between clock generator and clock oscillator is correct. The clock oscillator has a built-in reference, and does not need an external crystal or reference signal. The clock generator requires an external crystal or reference signal.

    Regards,