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4.0
Evaluation Board Operation
a
4.1
Configuration with On-Board Crystal Oscillator
the evaluation board of Hittite fractional PLL with integrated Vco should be set up as shown in the Figure
1. it should be noted that very low noise PLL with integrated Vcos are sensitive to noisy power supplies.
the evaluation board provides on-board regulators to isolate the +5.5V supply from the PLL analog and
digital +3.3V supplies, the PLL charge Pump +5V supply and the Vco +5V supply. the VcXo is also
regulated separately to +3.3V from the +5.5V external supply.
the very low noise of the PLL with integrated Vco requires a high quality test instrument to observe the
phase noise or jitter. For this we recommend a signal analyzer such as the agilent e5052B or equivalent.
a high performance spectrum analyzer can be used as an alternative to the signal analyzer.
Figure 2 highlights the major components and connectors on the PLL with integrated Vco evaluation
Board.
A - 3
v01.0910
PLLs WITH INTEGRATED VCO - MICROWAVE APPLICATIONS
Figure 1. Typical Setup of PLL with Integrated VCO Evaluation Board
Order On-line at
For technical application questions: Phone: 978-250-3343 or
EVALUATION BOARD OPERATING GUIDE
www.hittite.com
pll@hittite.com
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