LMK04000BEVALXO National Semiconductor, LMK04000BEVALXO Datasheet - Page 51

• Manufacturer Part Number: LMK04000BEVALXO
• Description: BOARD EVAL PREC CLOCK PLL XO
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMK04000BEVALXO

• Main Purpose: Timing, Clock Conditioner
• Embedded: No
• Utilized Ic / Part: LMK04000
• Primary Attributes: 122.88 MHz Crystal
• Secondary Attributes: Integrated PLL & VCO
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PLL1 has been designed to work with either an off-the-shelf VCXO package or with a user-
designed discrete implementation that employs a crystal resonator and associated tuning
components. The Figure 28 shows an example of a discretely implemented VCXO using a
crystal resonator.
LMK04000 Family evaluation boards are configured with either a VCXO or Crystal (-XO) on
board. It is possible to place a VCXO on a Crystal board or a Crystal on a VCXO board by
removing and replacing certain components on the board. Instructions for modifying the board
are presented in Appendix G: VCXO/Crystal changes.
Figure 29 below shows the crystal oscillator circuit diagram.
CLKin0
CLKin1
DATA
CLK
LE
Interface
Figure 28 - LMK040xxB with the XTAL Resonator option and Tuning Circuit
uWire
L M K 0 4 0 X X - R E V 3
R
1
PLL1
N
1
E V A L U A T I O N
R
2
PLL2
51
B O A R D
N
2
CHAN
CHAN
DIV
DIV
VCO
O P E R A T I N G
DIV
LVPECL, LVDS,
5 Output Clock
VCO
Channels
LVCMOS
I N S T R U C T I O N S
CLKout_0
CLKout_4
F
OUT