Datasheet

18 SNAU075A LMK3806 Evaluation Board November 2013
Copyright © 2013, Texas Instruments Incorporated
Clicking on the values in the box containing the Internal Loop Filter component (R3, C3, R4, C4) allow
one to step through the possible values. Left click to increase the component value, and right click to
decrease the value. These values can also be changed in the Bits/Pins tab.
The Reference Oscillator value field may be changed in either the Clock Outputs tab or the PLL tab.
The PLL Reference frequency should match the frequency of the onboard Crystal.
PLL Tab
Figure 9: PLL Tab
The PLL tab allows the user to change the following parameters in Table 5.
Table 5: Registers Controls and Descriptions in PLL Tab
Control Name Register Name Description
Reference Oscillator
Frequency (MHz)
OSCin_FREQ OSCin frequency from the External OSCin
connector or Crystal.
Phase Detector Frequency
(MHz)
n/s PLL Phase Detector Frequency (PDF). This
value is calculated as:
PLL PDF = OSCin Frequency
*(2
EN_PLL_REF_2X
) / (PLL_R).
VCO Frequency (MHz) n/a Internal VCO Frequency should be within
the allowable range of the LMK03806B
device.
This value is calculated as:
VCO Frequency = PLL PDF * (PLL_N *
PLL_P).