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LMX2595: datasheet figure 15 and ramp rate

Rich_S
Prodigy 30 points
Part Number: LMX2595

LMX2595 datasheet Figure 15 shows a time scale of 100 usec/div, and that time scale indicates the ramp is 120 MHz in 100 usec.   There are marker values listed on the plot suggesting that ramp happens in about 2 usec.   Seems like conflicting information.   

Is a 50 MHz / usec calibration free VCO ramp possible?    And that faster ramp is limited to the VCO sub bands?

Rich

  • 0
    TI__Guru* 95190 points

    Hi Rich,

    The marker is wrong. The rate of ramp was set to 120MHz/100µs. 

    The rate of ramp is limited by the possible loop bandwidth. A faster ramp rate requires higher loop bandwidth. We may not get linear ramp if the rate is too fast that the loop filter is not able to response in time.