SNAS800B July 2021 – February 2024 LMX1204
PRODUCTION DATA
The SYSREF windowing can be used to internally calibrate the timing between the SYSREFREQ and CLKIN pins to optimize setup and hold timing and trim out any mismatches between SYSREFREQ and CLKIN paths. This feature requires that the timing from the SYSREFREQ rising edge to the CLKIN rising edge is consistent. The timing from the SYSREFREQ rising edge to the CLKIN rising edges can be tracked with the rb_CLKPOS field. Once the timing to the rising edge of the CLKIN pin is found, then the SYSREFREQ rising edge can be internally adjusted with the SYSREFREQ_DELAY_STEP and SYSREF_DELAY_STEPSIZE fields to optimize setup or hold times.