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Evaluation Board User Guide
UG-076
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
AD9520-x Evaluation Board
See the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 16
FEATURES
Simple power connection using 6 V wall adapter and
on-board LDO voltage regulators
LDOs are easily bypassed for power measurements
5 ac-coupled differential LVPECL SMA connectors
7 LVPECL differential headers for additional outputs
SMA connectors for
2 reference inputs
Charge pump output
Clock distribution input
USB connection to PC
Microsoft Windows-based evaluation software
with simple graphical user interface
On-board PLL loop filter
Easy access to digital I/O and diagnostic signals via
I/O header
Status LEDs for diagnostic signals
APPLICATIONS
Clocking of analog-to-digital and digital-to-analog
converters up to 2.9 GHz
Networking and communications line cards
Test and measurement equipment
Wireless base stations, controllers
Clock cleanup/jitter attenuation
Clock distribution
GENERAL DESCRIPTION
The AD9520-x (hereafter referred to as AD9520) is a very low
noise PLL clock synthesizer featuring an integrated VCO, clock
dividers, and up to 24 outputs. The AD9520 features automatic
holdover and a flexible reference input circuit allowing for very
smooth reference clock switching. The AD9520 family also
features the necessary provisions for an external VCXO.
The AD9520 evaluation board is a compact, easy-to-use
platform for evaluating all features of the AD9520. This user
guide covers all six versions of the AD9520 family.
Although the Quick Start Guide to the AD9520 PLL section
applies specifically to the AD9520-4, increasing the N (feed-
back) divider and channel divider increases the VCO frequency
to the allowable frequency range of other AD9520 versions.
For the AD9520-5, which lacks the internal VCO, certain
portions of this user guide that apply to the internal VCO (such
as VCO calibration) can be ignored.
This document covers the AD9520 family. The AD9522 family,
which is identical to the AD9520 except that it has LVDS
outputs, is covered in UG-077.
For convenience, detailed information from the AD9520 data
sheet has been included here. Use this user guide in conjunction
with the AD9520 and AD9522 data sheet and software
documentation available at www.analog.com.
AD9520 EVALUATION BOARD
0
8746-001
Figure 1.
