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LMK04828BEVM: Settling Time For the Clock

Ajmal Rashid
Prodigy 100 points
Part Number: LMK04828BEVM
Other Parts Discussed in Thread: LMK04832, LMX2594

Tool/software:

Hi Team,

I'm using the below loop filter configuration for the Cpout pin of LMK04828B and LMX2594RHAR. I need to calculate the settling time for the clocks after the re-configuration of the device. Could you please help to to calculate the settling time? What is the procedure to calculate the settling time for the output clocks?

  • +1
    TI__Mastermind 28982 points

    Hi Ajmal, 
    The analog settling time is dependent on a variety of factors including loop bandwidth, frequency, charge pump current, etc. 
    A good estimation for lock time is 4/LBW (loop bandwidth) 

    Given LMK048xx or LMK04832 family are not used for frequency hopping, the lock time is not cared for. 
    Devices such as LMX family which are high performance RF synthesizers can have the lock time estimated using PLLatinumSim - the reason this feature is supported for the LMX devices is due to applications such as frequency hopping where the lock time does matter. 
    usually, LMK048xx or LMK04832 will stay locked at the same frequency where lock time isn't of interest. 

    You can estimate the lock time for LMX2594 in PLLatinumSim. 

    Best regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    Prodigy 100 points

    Thanks for the quick reply!!