LMK04000BEVAL/NOPB National Semiconductor, LMK04000BEVAL/NOPB Datasheet - Page 4

• Manufacturer Part Number: LMK04000BEVAL/NOPB
• Description: BOARD EVAL PRECISION CLOCK PLL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMK04000BEVAL/NOPB

• Main Purpose: Timing, Clock Conditioner
• Embedded: No
• Utilized Ic / Part: LMK04000
• Primary Attributes: 122.88 MHz VCXO
• Secondary Attributes: Integrated PLL & VCO
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMK04000BEVAL; LMK04000BEVAL

LMK040xx evaluation boards are typically configured with both a VCXO and crystal-based oscillator
circuit. The VCXO frequency may either be 100 MHz or 61.44 MHz. The crystal frequency is typically
12.288 MHz. These evaluation board instructions apply to either configuration. Figure 3 illustrates the
oscillator circuit based on a pullable crystal resonator.
Note: only one of the oscillators (VCXO or crystal) is activated in the default board configuration.
The user may switch between oscillator types by removing and replacing certain components on the
board. Instructions for modifying the board are presented in Appendix G.
CLKin0
CLKin1
DATA
CLK
LE
Interface
uWire
Figure 2. LMK040xx with the XTAL Resonator option and Tuning Circuit
L M K 0 4 0 X X
R
1
PLL1
N
1
E V A L U A T I O N
R
2
PLL2
B O A R D
4
N
2
CHAN
CHAN
DIV
DIV
O P E R A T I N G
VCO
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