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LMX2594: Power up sequence

Toshihiro Watanabe
Genius 10235 points
Part Number: LMX2594


Hello,

Is there any power up sequence? We couldn't see output power sometimes when the below sequence is using.

Powerup LMX2594 -> Application powerup and write the registers -> 10MHz reference clock input.

Best regards,

Toshihiro Watanabe

  • 0
    TI__Guru** 110530 points
    Hi Watanabe-san,

    You should program the device after the reference clock is ready.
    Recommended sequence:
    1. Vcc power up
    2. Provide a reference clock to the device
    3. Program RESET=1 to reset registers
    4. program RESET=0 to remove reset
    5. program all the registers in reverse order from highest to lowest
    6. (optional) program register R0 one additional time to ensure that the VCO calibration runs from a stable state