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A clock buffer solution for AR glasses

Stacey Yin
Prodigy 325 points
Other Parts Discussed in Thread: CDCLVC1102, CDCLVP1102, CDC3RL02

Could suggest a solutoin use on 24MHz clock buffer use on AR glasses?

We want to redriver 24MHz camera clock because the clock trace is too long:

CPU 24MHz CLOCK --> 1.5m Coax cable(50ohm) --> (Clock Redriver)  --> 450mm FPC -- camera board (2inchs PCB trace to camera module.)

Please help to advice a solution suit on this application. Thanks.

  • 0
    TI__Genius 16845 points

    Can you provide this information:

    • How many copies of the 24 MHz clock do you need?
    • What format is the clock from the CPU? (CMOS, LVDS, LVPECL, etc.)
    • What format does the clock need to be to the camera board?

    Without knowing your requirements, I can recommend CDCLVP1102 or CDCLVC1102. Will these devices meet your application requirements?

    Kind regards,
    Lane

  • 0
    TI__Expert 5370 points
    Dear stacy,

    Thank you for looking at our large buffer porfolio.

    It appears you are looking for for single ended driver into 50 ohm.

    I would look at CDCLVC1102.

    Another very handy resource to look at is the parametric search engine on TI.com. You can sort for your use case and get multiple device to select from.

    I hope this helps,

    Regards, Simon.
  • 0
    TI__Mastermind 32575 points

    Hi Stacey,

    I would suggest CDC3RL02 if you care about the following features:

    • 1 or 2 outputs
      • 1.8-V output levels (Voh regulated by internal 1.8-V LDO)
      • Low additive jitter: 0.37 ps RMS
      • Adaptive output driver to minimize EMI and control reflections
      • Individual clock enable pins

    • 1 single-ended input
      • 0.3~1.8 Vpp input swing, AC-coupled to pin
      • Square-wave or sine-wave (can handle attenuated signal from coax cable)
    • 2.3-V to 5.5-V power supply range
      • Low power: ~10 mW (3.3V supply, 24 MHz clock)
      • Internal LDO for high power supply noise rejection

    • Smallest package (0.8 mm x 1.6 mm, DSBGA-8)
    • Low cost - targeted for mobile/handset

    Regards,
    Alan