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LMK03000: Free run as master? 'OSCin' values

Colin Wood
Prodigy 10 points
Part Number: LMK03000

Good morning,

I am looking at using the LMK03000 as a free running master clock generator or slave locked to master clock.

In slave mode the OSCin will be 1.6MHz or 2 MHz. What OSCin freq. should I program?

Data sheet states 'round to nearest MHz' (2MHz) , o.k fine for 2MHz what about 1.6MHz?.

In master mode I want the LMK03000 to generate the 1.6MHz or 2MHz system ref. clock. This will feed back to itself at 'OSCin'. 

For 1.6MHz if I use 'nearest MHz' (2MHz) how can the VCO produce (divided down) 1.6MHz, if it can?

Also, before programming, OSCin will be unknown freq. What will happen when 'calibration procedure' activates?

Thanks, Colin

  • 0
    TI__Mastermind 20900 points

    Hi Colin,

    the OSCIN_FREQ register must be programmed in order to support proper operation of the internal VCO tuning algorithm. 2MHz is fine for 1.6MHz input of the target device.

    I am not quite sure if I understand the comment on the Controller device. What do you mean by 'this will feed back to itself at OSCIN'? Can you draw a block diagram of your system with the Controller and Target device?

    Here is a config that generates 1.6 MHz and 2 MHz

    See here the power on default. All outputs are disabled. So, you should program the device, apply the reference, calibrate the VCO and enable the outputs.

    note: 

    regards,

    Julian