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LMX2491: Continuous Triangular Ramp Example

Mason Noh
Expert 2490 points

Part Number: LMX2491

Hi~

I want to make continuous triangular ramp pattern.(datasheet 8.2.9)

OSCin: 50Mhz, VCO: 1500Mhz

I measureed right waveform with MOD,TRG1(Figure 27) but CPout is not.

I follow datasheet's figure 24 and figure 25.

It need another setting?

  • 0
    TI__Expert 5370 points
    Dear Mason,

    The example you refer to is a documented example and should work. If I understand right, you say that monitoring the Vtune point (pin 29 of U2) you do not see a triangular waveform. Do not check CPout as different with 3rd order filter. I am somewhat confused if you are able to see MOD and TRIG1 correctly that means something is working. Could you check the output?