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How to simulate LMX2492 frequency ramping?

Ricardo Monleone
Prodigy 40 points
Other Parts Discussed in Thread: LMX2492

Hello!

Does T.I. offer a software simulator to analyze the frequency ramping functionality of the LMX2492 PLL chip?

As an example, I would like to simulate and analyze ramp linearity or frequency error during the execution of a sawtooth frequency ramp in function of various loop filter settings and ramp parameters.

I've tried with the PLLatinumSim software but it seems to me that this simulator can only simulate static output frequencies.

I've also tryed Webench, but it doesn't seem to allow simulation of ramps either.

Thanks for any suggestion!

  • 0
    TI__Mastermind 28001 points

    Monle,

    Our simulation tools have no way to simulate the ramping, nor are their any plans to do this.

    As  a general rule of thumb, you want a wide loop bandwidth so the ramping does not get attenuated.   If you consider the desired output frequency as a function of time, you want the loop bandwidth to be ideally at least twice this modulation frequency.   If possible, it is typically very wide like 500 kHz.

    REgards,

    Dean