Texas Instruments Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 1.9 GHz VCO LMK04803BEVAL/NOPB LMK04803BEVAL/NOPB Scheda Tecnica

Codici prodotto

LMK04803BEVAL/NOPB

4 SNAU045A

LMK040xx Evaluation Board User’s Guide

November 2013

www.ti.com

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.