Datasheet

8 SNAU045A LMK040xx Evaluation Board User’s Guide November 2013
Copyright © 2013, Texas Instruments Incorporated
www.ti.com
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 (see Table 1).