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Jitter requirement for different application.

Other Parts Discussed in Thread: LMK04828, LMK03318, LMK04832, LMK03328, LMK5C33216

Hi team

Recently my customer faced some problem related to clock jitter, and hence they are interested in TI's jitter cleaner solution.

Before promoting TI solution, the customer wants to know the typical requirements of clock jitter for the following applications:

  • High-speed video interface such as HDMI1.3~HDMI2.1...
  • 10Gbps Ethernet
  • 5G network port.

Could you help give the clock jitter requirements for these application? Do we have documents to illustrate the clock jitter requirement?

Let me know if you have any questions.

  • Hi Shawn,

    Most of the high-speed video jitter requirements are specified in terms of bit error ratios, e.g. HDMI2.1 has BER 1e10 requirement that peak-to-peak TJ < 0.2Tbit (for a 12Gbps clock this comes out to TJrms of around 1.2ps, I believe). Most of the time the clocks and timing group measures jitter within some defined integration bandwidth, usually on some frequency-domain instrument such as a phase noise analyzer, so it is not always possible to convert our datasheet metrics to video specs. However, several of our jitter cleaners and even some of our clock gens can achieve many high-speed video interface standards. Examples include the LMK03318 or LMK03328 for clock generators, and the LMK04828 and LMK04832 for jitter cleaners.

    10G ethernet does not require a jitter cleaner - in most cases, a clock generator with <350fs RMS jitter in 12k-20M bandwidth is sufficient. The example devices above would easily suffice to meet these requirements.

    There are multiple different standards for what constitutes a 5G network port, and frequently these requirements are combined with stringent holdover and clock steering/PTP requirements. TI's network synchronizers portfolio has examples of devices suitable for 5G, notably the LMK5C33216.


    Derek Payne