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Frequency stability on the output of the deserializer LMH0031

Yauheni Pauliukovich
Intellectual 340 points
Other Parts Discussed in Thread: LMH0031

When I serialize through SDI on the 10GHz, the timing jitter is 1.1-1.2 ns. But it must be not more then 740 ps in accordance with SMPTE259M

http://sdi.org.ru/smpte-259m.pdf

sdi.org.ru



it is usual 250-350ps for majority TV-equipment.

What is the reason?

  • 0
    TI__Guru* 93670 points
    Hi Eugen,

    Timing jitter has a band pass filter from 10Hz to 1/(10) of the data rate. On the other hand, alignment jitter is from 100KHz to 1/(10) of the data rate. So if your alignment jitter is ok and there is issue with timing jitter then it means there must be some low frequency jitter between 10Hz and 100KHz that is causing timing jitter not meeting the SMPTE specifications.

    Please note SMPTE specifies measuring timing jitter at the output of the 75 ohm transmitter. LMH0031 is a deserializer. Please check timing jitter at the output of the transmitter in your system.

    Regards,,nasser