Is there an equation that works out the pll register values from the frequency in MHz for the HMC830 and 833?
Please see section 184.108.40.206 in the PLL Operating Guide at http://hittite.com/content/documents/operating_guide/pll_operating_guide_rf_vcos.pdf
Equation 13 calculates the VCO frequency as a function of three PLL register settings:
The Nfrac number referenced by EQ13 is a fractional number. You get this by dividing the number in Register 0x04 by 2E24.
Select an output divider setting (stored in VCO_reg0x02[5:0]) such that the HMC830 VCO always operates in the 1500MHz to 3000MHz range. The output divider will always be divide-by 1 when the output frequency falls within the 1500MHz to 3000MHz fundamental operation frequency range of the VCO.
The HMC833 includes an output doubler. Output frequencies between 3000MHz to 6000MHz require the doubler on and run the VCO at half the output frequency.
Moved this question on the HMC830 and HMC833 to the Hittite Microwave Products from ADI community.
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