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Original question:

LMK00301: LMK00301

LMK00301: LMK00301 difference between A & non-A version

Kay Chen53
Expert 2225 points
Part Number: LMK00301


Hi there:

I'd like to know the difference between LMK00301 & LMK00301A those two. 

From the spec could find the difference is about the "requires power sequencing or not".

Is that meaning the required current from power supply would be different? 

If our customer application is input 100MHz HCSL and output 100MHz*9, the suggested P/N would be LMK00301  or LMK00301A? 

  • 0
    Expert 2225 points

    update the description from datasheet

  • 0 in reply to Kay Chen53
    TI__Expert 5370 points
    Dear Key,

    thank you for your question.

    I have not measured each device but I will assume that the phase noise performance of the A version versus the non-A version is identical. Some precaution are needed on the non-A version at power up.

    Regards,
    Simon.
  • 0 in reply to Simon Damphousse
    Expert 2225 points
    Hi Simon:

    thanks, but under what special case if we need to consider the power supply sequence?
  • 0 in reply to Simon Damphousse
    Prodigy 10 points

    Dear Simon :

    Wel , I am Accton's HW Engineer ,

    Which different is about LMK00301 & LMK00301"A" in schematic design  ?

    Can the LMK00301"A"'s all power connect together and LMK00301's all power need independent to connecting

    or other about power sequence design request ?

    Thanks.

    JY_chang

  • 0 in reply to JY Chang
    TI__Mastermind 32575 points
    Hello,

    From datasheet section 11.1:

    "For the LMK00301, when powering the Vcc and Vcco pins from separate supply rails, it is recommended for the supplies to reach their regulation point at approximately the same time while ramping up, or reach ground potential at the same time while ramping down. Using simultaneous or ratiometric power supply sequencing prevents internal current flow from Vcc to Vcco pins that could occur when Vcc is powered before Vcco.

    For the LMK00301A, there is no power supply sequencing requirement between Vcc and Vcco."

    For both A and non-A devices, there is no special consideration when powering Vcc and Vcco pins from a single 3.3 V supply.

    Regards,
    Alan