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4
SNAU037A
LMK01000 Evaluation Board
November 2013
Copyright © 2013, Texas Instruments Incorporated
Equipment
Power Supply
The Power Supply should be a low noise power supply. An Agilent 6623A Triple power supply with LC filters on the
output to reduce noise was used in creating these evaluation board instructions.
Phase Noise / Spectrum Analyzer
For measuring phase noise an Agilent E5052A is recommended. An Agilent E4445A PSA Spectrum Analyzer with the
Phase Noise option is also usable although the architecture of the E5052A is superior for phase noise measurements. At
frequencies less than 100 MHz the local oscillator noise of the PSA is too high and measurements will be of the local
oscillator, not the device under test.
Oscilloscope
The oscilloscope and probes should be capable of measuring the output frequencies of interest when evaluating this
board. The Agilent Infiniium DSO81204A was used in creating these evaluation board instructions.
Reference Oscillator
The on board crystal oscillator will provide a low noise reference signal to the device at offsets greater than 1 kHz.
Note: The default loop filter has a loop bandwidth of ~60 kHz. Inside the loop bandwidth of a PLL the noise is greatly
affected by any noise on the reference oscillator (OSCin). Therefore any noise on the oscillator less than 60 kHz will be
passed through and seen on the outputs. For this reason the main output of a Signal Generator is not recommended for
driving OSCin in this setup.