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Software Operation
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14
SLAU467D – November 2012 – Revised February 2017
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ADS42JB46, ADS42JB49, and ADS42JB69 Evaluation Module
3.3.2
PLL2 Configuration
Clicking the
PLL2 Configuration
tab opens a new window with a block diagram of PLL2 as shown in
Figure 9
. This panel controls the PLL2 settings of the LMK04828. Once these values are properly entered
and PLL2 becomes locked, LED D4 (PLL2 Locked) on the ADS42JBxxEVM illuminates. A wrong divider
value would be a reason for this LED not illuminating. Use the LMK clock design tools when determining
external PLL loop filter components. Go to the LMK04828 product folder on the TI website to download
this tool and other application notes.
Figure 9. LMK04828 PLL2 Controls
