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LMX2594: noise problem

Sam Sun
Intellectual 875 points


ss

  • 0
    TI__Guru** 112000 points

    Hi Sam,

    phase noise increase at 7500MHz because it is a fractional channel with very large randomization configuration. That is, PLL_DEN is a very big number and is not an integer multiple of fosc. If you set PLL_DEN to, say, 100000000, phase noise should be good. However, if you set PLL_DEN to 100000001, then phase noise will be bad again.

    when you change frequency, you don't need to program R0 to disable FCAL_EN.