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LMX2582: Decreasing Lock Time (50 us)

Artur Khasanov
Prodigy 20 points
Part Number: LMX2582 
How can I determine the number VCO core of LMX2582 on any frequency for manual choose the VCO core from which start FCAL? I need this for fast frequency hoping (50 us).
When I read reg23 [13:11] VCO_SEL on any frequency I read the same number "1" constantly.

  • 0
    TI__Expert 8505 points

    Hi Artur,

    Readback on that register actually just reads the values that the user set, it doesn't show what VCO is reached post the auto calibration process.

    To find the boundaries of the VCO, you can do this: VCO_SEL_FORCE=1 (to force VCO selection), VCO_CAPCTRL_OVR=1 (to force VCO capacitor bank selection), then VCO_SEL= [the VCO you want to check], then check VCO_CAPCTRL= 0 (to the check the upper bound) and 183 (to check the lower bound). This way you find the exact boundaries of each VCO.

    Hope this helps!