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ISLA216P25 Arkusz danych(PDF) 3 Page - Intersil Corporation |
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ISLA216P25 Arkusz danych(HTML) 3 Page - Intersil Corporation |
3 / 25 page Application Note 1837 3 AN1837.0 May 3, 2013 Software Start-Up The FPGA clock is derived from the ADC output clock, and the FPGA clock must be active for the software to operate correctly. Therefore, it is critical to have a convert clock present and the board powered up before the Konverter software is launched. It is not necessary to have an analog input signal present. The compressed MATLAB files are unpacked the first time the GUI is invoked after installation. This will slow the start-up the first time the evaluation system is used but it will run more quickly in subsequent startups. Complete information can be found in the KMB-001 Installer manual at: http://www.intersil.com/converters/adc_eval_platform/ The main Konverter Analyzer window is shown in Figure 16. The application opens in FFT mode by default, but other modes can be selected using the radio buttons in the lower left corner. In each mode, relevant parameters are displayed in the data box the left side of the window. The following data is displayed in all operating modes – 1. Fsamp: Sample clock frequency, automatically detected. 2. Ffund: Input frequency, automatically detected if input is a single tone or dominant tone waveform 3. Fund: Amplitude of the dominant tone in dBFS 4. Samples: Record length, defaults but can be updated Data Acquisition Normally, the first step to an FFT data display is to open the “Setup” key in the upper left and pick a windowing function to limit spectral leakage. All the plots and data here used the Blackman Harris 4 term windowing. It is also possible to change the record length for the FFT in this screen. Normally, the continuous calibration and background keys are selected and, if desired, an averaging of the FFT outputs may be selected in the lower left of the Konverter screen set up for FFT display (default at start-up). Then, press “Run” in the lower left and the FFT will be updating. The number of averaged sweeps defaults to 10, but can also be changed in the “Setup” conditions dialog window. Menu items and the toolbar buttons may not function properly if data is being captured continuously. Press “Stop” in the lower left before selecting a menu item or using a toolbar button. AN1433 should be consulted for more information on the options provided in the Konverter windows. AN1434 offers help for first time installation if needed. Hardware and Analog Signal Path Description Figure 2 shows a close-up of the ISLA214P50-55210EV1Z daughtercard. The SMA at the top left is the analog input connection, the next one down is an optional sense port for an attenuated version of the differential signal being presented to the ADC input pins, while the lower SMA is the clock input pin. Several optional inputs are not populated, like the amplifier disable control line at the lower left of the card and some alternate clock input paths on the bottom. The VTEST path SMA is not populated on the board as delivered but may be easily added. FIGURE 2. ISLA214P50-55210EV1Z DAUGHTERBOARD |
Podobny numer części - ISLA216P25 |
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Podobny opis - ISLA216P25 |
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