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LMK05318: Vco1 pll1 read frequency from registers

Luca Meloni
Intellectual 420 points
Part Number: LMK05318

Hello everyone. is there a way by reading the registers to know the frequency to which the pll1 is tuned in dpll on mode?

The center frequency is 2.5Ghz, but i can read or calculate te real frequency in dpll mode and in lock condition?

  • 0
    TI__Expert 6140 points

    Hello, 

    In DPLL mode, the reference sets the VCO center frequency since the DPLL will correct for XO ppm error. So if your reference has 0 ppm, then the output will have 0 ppm and VCO is perfectly locked at 2.5 GHz. 

    In free running mode (no reference), VCO will have the XO ppm error. And that will be the error on the output. 

    You can always read PLL_NUM_STAT registers, (which are current values as set by the DPLL vs what's programmed into the PLL_NUM), to get the exact values. Below you'll find the register numbers. 

    Thanks and regards,

    Amin 

    From 5318 register map document: 

  • 0 in reply to Amin Eshraghi
    Intellectual 420 points

    Ok perfect. Best regards!