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LMX2572: Sequence of input signals

Shuhei Goto
Expert 7020 points

Part Number: LMX2572

Hi team,

Please let me know correct sequence (timing) following input signals:

  • OSCinP (8pin
  • SCK (16pin
  • SDI (17pin
  • VccCP (11pin

Allso, is there any regulation about  rise time and fall time of SCK, SDI?

Best regards,

Goto

  • +1
    TI__Guru** 120060 points

    HI Shuhei,

    There is no specific sequence, typical sequence would be Vcc power up before OSCin or SPI signal, you could also have OSCin and SPI signal ready before Vcc power up LMX2572, we do this all the time in the lab.

    A slew rate of at least 30 V/μs is recommended for the SPI signal.