SNAS783C June 2020 – February 2021 LMX2820
PRODUCTION DATA
The reference path consists of an OSCIN doubler (OSC_2X), Pre-R divider, multiplier (MULT) and a Post-R divider. The OSCIN doubler (OSC_2X) can double up low OSCIN frequencies. Pre-R (PLL_R_PRE) and Post-R (PLL_R) dividers both divide frequency down while the multiplier (MULT) multiplies frequency up. The purposes of adding a multiplier is to reduce integer boundary spurs or to increase the phase detector frequency. Use Equation 1 to calculate the phase detector frequency, fPD: