LMX25311146EVAL National Semiconductor, LMX25311146EVAL Datasheet - Page 6

• Manufacturer Part Number: LMX25311146EVAL
• Description: BOARD EVAL FOR LMX25311146
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMX25311146EVAL

• Main Purpose: Timing, Frequency Synthesizer
• Utilized Ic / Part: LMX2531LQ1146E
• Silicon Manufacturer: National
• Silicon Core Number: LMX2531
• Kit Application Type: Clock & Timing
• Application Sub Type: Frequency Synthesizer
• Kit Contents: Board, Cable, CD
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

L M X 2 5 3 1 L Q 1 1 4 6 E
E V A L U A T I O N
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
Free-Running VCO Phase Noise (Internal Divide by 2 Disabled)
The plots to the left show the true phase noise capability of the
VCO. In order to take these plots, the E5052 phase nose
analyzer was used.
The method was to lock the PLL to the
proper frequency, then disable the EN_PLL, EN_PLLLDO1, and
EN_PLLLDO2 bits. The equipment needs to be able to track
the VCO phase noise to measure in this way, and one can not
let the VCO drift too far off in frequency. If this kind of equipment
is not available, the VCO phase noise can also be measured by
making a very narrow loop bandwidth filter.
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