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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. DIGITAL PICTURE OF THE EVALUATION BOARD Adobe Systems 08129- 001 Figure 1. AD9551 Evaluation Board, Revision D 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 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 REVISION HISTORY 4/09—Revision 0: Initial Version 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 Evaluation Board Software section for details on running the AD9551 evaluation board software. 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, co...
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