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Urgent question for LMX2581 output frequency incorrect using codeloader

angela zhou
Prodigy 175 points
Other Parts Discussed in Thread: LMX2581, CODELOADER

Hi,

I have problems with configuring correct output frequency for LMX2581 using codeLoader:

1. sometimes the output frequency is correct, but most time my output frequency is almost half of what I expect, and its Vp-p is more than double of Vp-p I expect.

2. Oscin = 100MHz, Multiplier x1, R Counter = 1, Phase Detector Freq = 100MHz, N counter = 37, PLL_NUM = 2400000, PLL_DEN = 4000000, RFoutB = fVCO = 3760MHz, RFoutA = fVCO / channel_div = 188MHz

Below is two waveform I captured under exactly same settings but the output frequency are off by almost half

  • 0
    TI__Guru* 94160 points
    Hi Angela,

    would you provide us your codeloader configuration file? in codeloder, File --> Save.
    BTW, could you try to use TICS Pro to program the device? TICS Pro is our new GUI which will eventually replace codeloader in future.