LMK04000BEVALXO National Semiconductor, LMK04000BEVALXO Datasheet - Page 47

• 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

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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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