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LMK04832: Max SPI clock frequency

Taketo Sato
Genius 10315 points
Part Number: LMK04832

Hello team,

Datasheet of LMK04832 says tsclk min is 200ns.

Is it correct information?

5MHz sounds slow compared to other SPI devices.

Best regards,

  • +1
    TI__Mastermind 33580 points

    Hello Sato-san,

    The datasheet is correct, 5MHz is the maximum SPI rate for this device.

    Other devices in our synthesizers portfolio have an "assisted calibration" concept which allows the user to program several coefficients on the VCO for fast frequency switching.  In order to facilitate fast switching, the supported SPI frequency needs to be very high. With a jitter cleaner like LMK04832, the device is usually configured only once at startup, so programming time is rarely a concern.

    We actually have ATE characterization data showing that devices are usually capable of ~13MHz SPI at 6σ conditions, so I am not sure why we rated this device's SPI frequency so low.

    Regards,

    Derek Payne