JAJSDN8C March 2017 – April 2019 LMX2594
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: