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LMX2592- Programming using the burst mode in TICS pro

shilpa g
Prodigy 10 points


Hi,
We are using LMX2592 in a SFCW radar. We need to vary the output frequency in steps by changing the N divider value. We need the following frequencies to be generated sequentially in a loop :3800 , 4000, 4200,4400,5000....etc ( in MHz ).  How can we use the burst mode to write different values to the register (R38) with a time gap of say 2 seconds between the register updates?

It seems to only use the final value of the register and doesn't update sequentially. We also checked if these desired frequencies are generated by using a spectrum analyser, but it doesn't seem to have been generated.

Can you please help me here?

Thanks,

Shilpa

  • 0
    TI__Expert 8505 points
    Hi Shilpa,

    In the Burst Mode menu:
    1. in PLL menu: configure the N value that gives the frequency you want
    2. in the Burst Mode menu: select the "Load Register" drop down and select R38 (which is the register for N)
    3. in the Burst Mode menu: select the "Load Register" drop down and select R0 (this triggers calibration for each frequency change)
    4. in the Burst Mode menu: change the number under "Delay" to 2, then click "Delay"
    5. repeat steps 1-4 for each of your frequencies
    6. in the Burst Mode menu: check the box "Loop?"
    7. in the Burst Mode menu: click "Run" and it will repeats itself


    Regards,

    Brian Wang