Datasheet

L M K 0 4 1 X X - R E V 3 E V A L U A T I O N B O A R D O P E R A T I N G I N S T R U C T I O N S
SNLU099
11
PLL2 Tab
Figure 5 - PLL2 tab.
The PLL2 tab allows the user to change:
VCO frequency
PLL2 Phase detector frequency
PLL2 R-counter value
PLL2 N-counter value
The frequency of the external VCXO (or XTAL oscillator). Note: This value must be
entered in both the PLL1 and PLL2 tabs.
PLL2 Charge pump gain
PLL2 Charge pump state
Any changes made on this tab are reflected in the Clock Outputs tab. Note that the PLL2 Phase
Detector polarity is fixed and cannot be changed by the user. Also note that the VCO frequency
should conform to the specified frequency range for the device.
Note that the value entered in the VCO frequency field on the PLL1 tab must match the
Reference Oscillator frequency entered on the PLL2 tab and the OSCin_FREQ on the Bits/Pins
tab. Updating the PLL2 tab Reference Oscillator frequency will automatically update the value
of OSCin_FREQ on the Bits/Pins tab. The only time that the Reference Oscillator frequency of
PLL2 tab will be different from the VCO frequency of PLL1 is when the EN_PLL2_REF2X
mode is enabled.