Analog Devices UG-002, AD9551 User Manual
Evaluation Board User Guide
UG-002
One Technology Way • P. O . Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel : 781.329.4700 • Fax : 781.461.3113 • www.analog.com
Evaluating the AD9551 Multiservice Clock Generator
FEATURES
Simple power connection using USB connection and
on-board LDO voltage regulators
LDOs are easily bypassed for power measurements
AC-coupled differential LVPECL SMA connectors
SMA connectors for
2 reference inputs
2 PLL lock detect outputs
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
USB computer interface
Dip switch configurable for manual operation
Software calculator provides flexibility, allowing programming
almost any rational input/output frequency ratio
DIGITAL PICTURE OF THE EVALUATION BOARD
GENERAL DESCRIPTION
This user guide describes the hardware and software of the
AD9551 evaluation board and includes detailed schematics and
PCB layout artwork. The AD9551 Revision D evaluation board
is a compact, easy to use platform for evaluating all features of the
AD9551 multiservice clock generator.
The AD9551 accepts one or two reference input signals to
synthesize one or two output signals. The AD9551 uses a
fractional-N PLL that precisely translates the reference frequency
to the desired output frequency. The input receivers and output
drivers provide both single-ended and differential operation.
Reference conditioning and switchover circuitry internally
synchronizes the two references so that if one reference fails,
there is virtually no phase perturbation at the output.
The AD9551 uses an external crystal and an internal DCXO to
provide for holdover operation. If both references fail, the device
maintains a steady output signal. This may mislead you to believe
that the PLL is locked and the board is configured properly. A
simple test is to move the input REF A or REF B clock a few kilohertz and verify that the changes in output frequency track the input.
Figure 1.
See the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 12
AD9551 Evaluation Board, Revision D
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UG-002 Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Digital Picture of the Evaluation Board ......................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Setting up the Power and PC Connections ............................... 3
Setting up the Signal Connections ............................................. 3
Bypassing the USB Power Supply ............................................... 3
Evaluation Board Software .............................................................. 4
Installing the Software ................................................................. 4
Using the Software ........................................................................ 4
Guide to Programming the AD9551 .............................................. 5
REVISION HISTORY
4/09—Revision 0: Initial Version
Using an SPI Port ..........................................................................5
Using Dip Switches (Manual Control) .......................................5
Using Software to Override Dip Switches (Software Control) ..... 5
Software Operation ...........................................................................6
Menu Bar of Main Window .........................................................7
Button Bar of Main Window .......................................................8
Using Software to Control the Functional Blocks of AD9551 ...... 8
Using Software to Calculate the Device Settings ................... 10
Routing 26 MHz to Test Port .................................................... 11
Setting the 19.44 MHz Mode .................................................... 12
ESD Caution................................................................................ 12
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Evaluation Board User Guide UG-002
EVALUATION BOARD HARDWARE
The following instructions are for setting up the physical
connections to the AD9551 evaluation board.
SETTING UP THE POWER AND PC CONNECTIONS
Set up the power and PC connections as follows:
1. Install the AD9551 evaluation software before connecting
the evaluation board to your PC for the first time (see the
Installing the Software section). Administrative privileges
are required for installation.
The AD9551 has the option of either being pin or register
programmable. If the pin programmable option is desired,
then no software is needed to control the part. However, it
is recommended to install the software because if it is not
installed, the computer will recognize the evaluation board
as new hardware and attempt to install drivers.
2. Connect the USB cables to the evaluation board and the
computer.
The red LED labeled VBUS (CR2) on the AD9551 evaluation
board should illuminate, and the USBSTAT LED should start
blinking. If the USBSTAT LED is not blinking, ensure that
the USB port on the PC is operational and that the USB cable
is not damaged.
3. If the Found New Hardware Wizard automatically
appears when the evaluation board is connected, select
Install the software automatically and then click Next.
The Found New Hardware Wizard may appear twice, and
a system restart may be required.
Refer to the
running the AD9551 evaluation board software.
Evaluation Board Software section for details on
SETTING UP THE SIGNAL CONNECTIONS
After setting up the power and PC connections, use the
following procedure to set up the signal connections:
1. Connect a signal generator to REF A SMA Connector J1.
By default, the reference inputs on this evaluation board
are ac-coupled and terminated 50 to ground. An
amplitude setting of 6 dBm is sufficient.
2. To connect a signal to REF B, connect the signal to SMA
Connector J2.
3. Connect an oscilloscope, spectrum analyzer, or other lab
equipment to any of the J3 to J6 SMA connectors on the
upper right side of the board. The output connectors are
single ended. A 50 Ω termination should be placed on all
unused outputs.
BYPASSING THE USB POWER SUPPLY
The evaluation board can be configured to supply power to the
AD9551 from an external power supply. Bypass the USB power
supply as follows:
1. Remove the F2 ferrite bead (located on the backside of
the board).
2. Connect a bench power supply to Pin 3.3V_1 of TB1 on
the evaluation board. In addition, resistors on the evaluation
board can be removed to further separate power supply
connections to the AD9551. This is useful for measuring
the AD9551 power consumption. Refer to the evaluation
board schematics provided on the CD in the evaluation board
kit (also available at www.analog.com) for further details.
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UG-002 Evaluation Board User Guide
EVALUATION BOARD SOFTWARE
The instructions included in this section are for setting up the
AD9551 evaluation board software.
INSTALLING THE SOFTWARE
Do not connect the evaluation board until the software
installation is complete. To install the software,
1. Insert the AD9551 evaluation software CD-ROM into a PC
CD disc drive.
2. Click My Computer, and then double-click the
AD9551EV CD icon.
A window opens showing the contents of the CD divided
into four sections: data sheet, layout, schematic, and software.
The readme.txt file contains a description of the CDROM contents, as well as any last minute instructions or
information.
3. Double-click the Software folder, and then double-click
AD9551Eval_Setup1.1.0.exe. Follow the installation
instructions. The default location for the evaluation
software is C:\Program Files\Analog Devices\AD9551
Eval Software\.
4. If there are any updates to the evaluation software on a
supplemental CD or in the \Software\Updates folder, be
sure to copy the new .EXE file, as well as any setup files, to
the default location.
USING THE SOFTWARE
After the evaluation software has been installed, you can run
the software as follows:
1. Power up and connect the evaluation board to the PC.
2. Double-click AD9551 Eval Software to run the AD9551
evaluation software.
A hardware installation window appears. Depending on
whether the evaluation board was found by the software, the
text in this window is either light blue, indicating that the
evaluation board was found, or red, indicating that the
evaluation board was not found.
3. If the evaluation board was found, click in the window
when the Evaluation Software Ready message appears.
The main window of the evaluation board software appears.
Proceed to the Guide to Programming the AD9551 section
for more details about using the software.
4. If the evaluation board was not found, a dialog box appears
that allows you to select an evaluation board to use while
the software runs in standalone mode. Standalone mode is
useful for viewing and generating register setup files.
5. If you connect the evaluation board while the evaluation
board software is running, the window shown in Figure 2
usually appears to prompt you to load the evaluation board
with the evaluation board software settings or to read the
current evaluation board settings into the software.
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Figure 2. SYNC Evaluation Software Window
6. If the evaluation board was not automatically detected
when it was connected, choose Select Evaluation Board
from the I/O menu, and then select EZSSP-0, EZSSP-1, or
EZSSP-2 (see Figure 3).
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Figure 3. Select USB Device Window
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