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Software Operation
13
SLAU467D – November 2012 – Revised February 2017
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Copyright © 2012–2017, Texas Instruments Incorporated
ADS42JB46, ADS42JB49, and ADS42JB69 Evaluation Module
3.3
LMK Controls
Click the
LMK04828
tab located at the top of the GUI. A new window opens to provide four tabs that can
be used configure the LMK04828,
Figure 8
shows the PLL1 Configuration, PLL2 Configuration, Sys and
Sync and Output Clock tabs. Clicking on each option opens a new panel in the GUI for control of that
section.
3.3.1
PLL1 Configuration
By default, the
PLL1 Configuration
tab is shown when LMK04828 tab is selected. To the right of the panel
is a block diagram, shown in
Figure 8
. This panel controls the PLL1 settings of the LMK04828. Once
these values are properly entered and PLL1 becomes locked, LED D1 (LMK Locked) on the
ADS42JBxxEVM illuminates. Some reasons for this not illuminating are using the wrong divider values or
the reference oscillator tolerance (ppm) is too large.
Figure 8. LMK04828 Outputs Control Window of the ADS42JBxx GUI
