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26
SNAU126A
LMK04906 Family: Low-Noise Clock Jitter with Dual Loop PLLs
Revised - December 2013
Copyright © 2013, Texas Instruments Incorporated
PLL1 VCO frequency (25 MHz) and PLL2 reference frequency (25 MHz)
PLL1 Tab
Figure 11: PLL1 tab
The PLL1 tab allows the user to change the following parameters in Table 7.
Table 7: Registers Controls and Descriptions in PLL1 tab
Control Name
Register Name
Description
Reference Oscillator
Frequency (MHz)
n/a
CLKin frequency of the selected
reference clock.
Phase Detector
Frequency (MHz)
n/a
PLL1 Phase Detector Frequency (PDF).
This value is calculated as:
PLL1 PDF = CLKin Frequency / (PLL1_R
* CLKinX_PreR_DIV), where
CLKinX_PreR_DIV is the predivider
value of the selected input clock.