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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
See the last page for an important warning and disclaimers.
DIGITAL PICTURE OF THE EVALUATION BOARD
AD9551 Evaluation Board, Revision D
Figure 1.
Rev. 0 | Page 1 of 12
Evaluation Board User Guide
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 kilo-
hertz and verify that the changes in output frequency track the input.
UG-002
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Summary of Contents for Analog Devices AD9551
-
Page 1: Features
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. -
Page 2: Table Of Contents
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 ... -
Page 3: Evaluation Board Hardware
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... -
Page 4: Evaluation Board Software
INSTALLING THE SOFTWARE Do not connect the evaluation board until the software installation is complete. To install the software, Insert the AD9551 evaluation software CD-ROM into a PC CD disc drive. Click My Computer, and then double-click the AD9551EV CD icon. -
Page 5: Guide To Programming The Ad9551
Evaluation Board User Guide GUIDE TO PROGRAMMING THE AD9551 The AD9551 can be programmed via an SPI port or by setting the logic levels on the frequency select pins of the device. To program the device using the serial port, the evaluation board software must be installed. -
Page 6: Software Operation
The main window of the AD9551 evaluation board software is comprised of subsections that correspond to the major functional blocks of the AD9551 (see Figure 4). These subsections, most of which have their own window, are outlined in this section. From the main window, the window for each functional block can be accessed by clicking the appropriate box in the main window. -
Page 7: Menu Bar Of Main Window
File Menu The File menu allows you to load a previously saved AD9551 setup file or to save a new AD9551 setup file. A setup file (.STP) is a text file that contains the AD9551 register setup file, plus any evaluation board settings. -
Page 8: Button Bar Of Main Window
Load and Save Clicking Load and Save allows you to load and save an AD9551 setup file. A setup file (.STP) is a text file that contains the AD9551 register setup file, plus any evaluation board settings. Update Clicking Update toggles the I/O update bit (Register 0x05, Bit 0) of the AD9551. - Page 9 Evaluation Board User Guide DLL Window Clicking Click for Details in the DLL box of the main window accesses the DLL window (see Figure 11). This window can be used to manually override the automatic time alignment between the REF A and REF B clock input signals to the PLL1 phase detector.
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Page 10: Using Software To Calculate The Device Settings
Output Loop Config: Box The Output Loop Config: box can be used to change the output frequency of the AD9551. This control changes the logic levels of the output frequency selection pins of the AD9551. Figure 17. Output Loop Config: Box (in Main Window) -
Page 11: Routing 26 Mhz To Test Port
ROUTING 26 MHz TO TEST PORT The following procedure explains how to route the 26 MHz crystal oscillator to the AD9551 test port. The test port is SMA J7 and is labeled output PLL locked. In this example, the input frequency is 122.88 MHz on REF A, and the output frequency is 122.88 MHz. -
Page 12: Setting The 19.44 Mhz Mode
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice.
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