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LMK04906 vs. LMK04816 vs. LMK0482xB

Jonas Reber
Prodigy 90 points
Other Parts Discussed in Thread: LMK04906, LMK04816, LMK04806, LMK04828

Hi,

for jitter cleaning and clock generation we are currently using an LMK04906 in our design (0-delay dual pll mode). I am now looking for an alternative chip that has more outputs than the LMK04906.

I found that the LMK04816 is pretty much identical to the LMK04906 in terms of phase noise and functionality (except of having more outputs). Am I right or did I miss something while comparing the two datasheets? If so how come the LMK04906 is in a different series (LMK049xx) than the LMK048xx?

The most interesting part for me is the LMK04828B because of its better jitter performance when compared to the previously mentioned parts (88fs RMS vs. 100fs RMS, 12k..20M). Apart of being JESD2048B compliant, what other advantage/disadvantage do I have when using the LMK04828B instead of the LMK04906/LMK04816?


Thank you for your inputs!

PS. the DS of the LMK04816 seems to contradict itself already on page 1: 1.1 features says 100fs RMS Jitter (12kHz to 20MHz) while the text in 1.3 description says (111fs rms jitter(12kHz to 20MHz).

  • 0
    TI__Mastermind 24205 points

    Hi Reber,

    LMK04906 has fewer outputs - 6 differential compared to 12 differential on LMK04816 

    LMK04906 is not pin compatible with LMK04816

    LMK04816 has provision to allow 2 additional OSCin buffered differential outputs compared to LMK04906

    LMK04906 will be targeted primarily towards wired comms applications where the requirement for the number of outputs is less. LMK04806/LMK04816 is positioned more towards data converter clocking applications where high output port count is desirable.

    On a high level, LMK04828 has additional differential clock outputs (15) compared to LMK048xx (14). It supports the low power high swing HSDS output format and adds support for cascaded zero delay mode. Also, the VCO performance on the LMK04828 is better than LMK048xx.

    There are scenarios where the jitter measured on the LMK04816 outputs is 100fs but for a typical use case the jitter will be ~110-115fs (12 kHz - 20 MHz)

    Regards

    Arvind Sridhar