Оценок - 3, средний балл: 4
(
)
)
|
Фрагмент инструкции
Ensure that Jumper JMP3 is positioned for PC control. 2. Verify that all five jumpers are in place on Connector P2. 3. Set the S1, S2, and S3 dip switch positions to high. 4. Select 622.08 MHz for the input frequency in the REF A (MHz) box in the main window of the evaluation software (see Figure 4 and the Reference Input Boxes section for more information). 5. Select 622.08 MHz for the output frequency in the Output Loop Config: box in the main window of the evaluation software (see Figure 4). 6. A frequency of 622.08 MHz should be observed on the OUT SMA connector. These steps assume that the input signal is present, that the evaluation board has not been modified, and that the PLL loop filter is suitable for the application. However, these steps are appropriate only for simple PLL operation (that is, to set up and run the PLL). See the AD9551 data sheet for more information about the various AD9551 features. 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. When a subsection window closes after clicking OK, you may notice that the LOAD button on the main window starts blinking. This indicates that there are settings that have not been loaded to the AD9551 evaluation board. Click LOAD to load these settings to the evaluation board. Adobe Systems 08129- 004 Figure 4. AD9551 Evaluation Software Main Window 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. To load a previously saved setup file, select Load Setup from the File menu. Note that you must still perform a VCO calibration. Alternatively, to save a new setup file, select Save Setup from the File menu. To exit the evaluation software, select Exit from the File menu. However, note that no checking is done to ensure that the existing setup is saved. I/O Menu The AD9551 evaluation system allows one PC to control multiple evaluation boards. The Select USB Device window, accessed by choosing Select Evaluation Board from the I/O menu, allows you to select which evaluation board the software controls (see Figure 5). Click Refresh List to detect a recently connected evaluation board. Adobe Systems 08129- 005 Figure 5. Select USB Device Window Selecting Configure Serial Port from the I/O menu allows you to control how the USB controller interacts with the AD9551 serial port (see Figure 6) by configuring Register 0x00 (shown as 00H in Figure 8). Adobe Systems 08129- 006 Figure 6. Serial Port Configuration Window View Menu The Debug window, accessed by selecting Debug Window from the View menu, allows you to write and read registers directly and to force the various configuration pins high or low (see Figure 7). Adobe Systems 08129- 007 Figure 7. Debug Window The Register Map Debug window, accessed by selecting Register Debug Window from the View menu, allows you to write and read registers (see Figure 8). Adobe Systems 08129- 008 Figure 8. Register Map Debug Window Help Menu Selecting Help from the Help menu opens the About AD9551 window, which contains information such as revision number, region information, and contact information. BUTTON BAR OF MAIN WINDOW The buttons described in this section provide easy access to common features. 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. Reset Clicking Reset resets the evaluation board and restores the AD9551 to its default power-up state. In addition, clicking Reset enables the VCO calibration function by writing the enable VCO calibration bit. USING SOFTWARE TO CONTROL THE FUNCTIONAL BLOCKS OF AD9551 The AD9551 evaluation software contains subsections that correspond to the major functional blocks of the AD9551. These subsections, most of which have their own window, are described in this section. You can access each window by clicking Click for Details in the appropriate subsection box of the main window. Most subsection boxes in the main window have a checkbox labeled SPI. If this box is selected, the software allows serial port writes when conditions are changed in the corresponding subsection window. When a subsection window closes after clicking OK, you may notice that the LOAD button on the main window starts blinking. This indicates that there are settings that have not been loaded to the AD9551 evaluation board. Click LOAD to ...
Эта инструкция также подходит к моделям:Компьютерные аксессуары - AD9551 (807.33 kb)