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LMX2572: VCO calibration time and ramp outputs

user5337362
Prodigy 110 points
Part Number: LMX2572

Hi, I’m after information in regards to how the device operates when the min VCO calibration time is set to zero while doing a ramp that requires calibration.

Specifically, I would like to know if the device does perform calibrations while the pause time is set to zero (or times shorter than a calibration can complete in) and how this will affect the ramp i.e when the PLL will update ect.

Thanks,

James

  • 0
    TI__Guru** 107090 points
    Hi James,

    The VCO will calibrate even if you set the "min. VCO calibration time" to zero. This parameter is not meant to change the VCO calibration characteristic, it is actually a delay or a pause time (see Figure 173 in the datasheet) being used to allow the VCO calibration to be completed before the next ramp happen.