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LMX2492: the process for modifying the register

Hui Cao22
Expert 1270 points

Part Number: LMX2492

We are currently using the LMX2492 for continuous wave sweep. If we need to modify the start frequency of the sweep online, what is the process for modifying the register? What we are trying now is to write all the registers once and successfully modify the starting frequency of the sweep. If only the changed registers are modified locally, the start frequency of the sweep will be incorrect. Could you please take a look at how to operate it?

  • 0
    TI__Guru** 119930 points

    Hi There,

    Once RAMP_EN = 1, we cannot change the start or stop frequency of individual ramp. We need to make RAMP_EN = 0, change the start / stop frequencies and then make RAMP_EN = 1 again. 

    However, during ramp, we can change the overall frequency via PLL_N and PLL_NUM.

    For example, if the ramp is between 9600MHz and 9800MHz, we can change the PLL_N and PLL_NUM value on-the-fly so that the ramp frequencies become 9750MHz and 9950MHz.