LMK04000BEVAL/NOPB National Semiconductor, LMK04000BEVAL/NOPB Datasheet - Page 47

• 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

Changing from VCXO to Crystal Resonator
If the board has been setup to use the VCXO for PLL1, the VCXO may be disabled and the
crystal enabled as described on the following pages:
Summary
Procedures
Figure 23
1. Remove power from VCXO
2. Disconnect VCXO RF path and connect Crystal RF path
3. Connect charge pump output from PLL1 to Crystal Loop Filter (B1) and Crystal
4. Connect charge pump output from PLL2 to Crystal Loop filter (B2)
1. Remove power from VCXO
a. Remove 0 ohm resistor in R26 (near the VCXO)
L M K 0 4 0 X X - R E V 3
E V A L U A T I O N
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O P E R A T I N G
I N S T R U C T I O N S