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LMX2572:FAST VCO calibration

LMX2572 datasheet  中注明有:FAST VCO calibration speed:<20us

在使用PLLATINUM sim 进行仿真,LOCK TIME 栏中不使能 Partial Asiist VCO Calibration 时VCO calibration time =132.8us,使能 Partial Asiist VCO Calibration 时VCO calibration time =54us,

请问LMX2572确实能够实现datasheet 中FAST VCO calibration speed:<20us么?如果能,仿真时应该如何设置?