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LMX2531LQ1500E

chengpeng duan
Prodigy 20 points
Other Parts Discussed in Thread: LMK00304

I want to ask a question that if I use the chip LMX2531LQ1500E for clock generation, then the clock is used as the sampling clock of DAC devices,I want to know whether a clock chip can drive two DAC devices.(do I need to add a drive circuit?).Thank you very much!

  • 0
    Mastermind 7395 points

    Although it is possible to drive two clocks with a single driver, it is not recommended and it is more and more problematic as the rise time of the clock signal goes up. You have to be very careful in the layout of such a signal, a disbalance between the two clock branches can cause reflections and in some cases, double clocking because of ringing close to the digital input threshold. The best, or at least safest, is to use separate outputs from a clock distributor. And always think about the impedance termination of your line on both sides of the connection.

  • 0 in reply to Avi Chami1
    TI__Mastermind 32575 points

    I suggest looking at LMK00304 as a low-additive-jitter, 4-output clock buffer/level translator that supports LVPECL outputs (up to 1.6 Vpp differential) and inputs up to 3 GHz to drive low-jitter clocks to multiple data converters.

    The applications information section in the datasheet shows examples for interfacing an RF sinewave signal to the CLKin inputs and for interfacing the LVPECL outputs to a differential clock receiver inputs.  I suggest using a balun to convert the RF sinewave (single-ended) to a differential signal and drive the CLKin input differentially for best performance.

    Regards,
    Alan