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ISLA214P50 Datasheet(PDF) 2 Page - Intersil Corporation |
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ISLA214P50 Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 25 page Application Note 1837 2 AN1837.0 May 3, 2013 OPERATING PRECAUTIONS:!! IT IS STRONGLY RECOMMENDED TO INSERT THE +5V PLUG AT THE MOTHERBOARD PRIOR TO PLUGGING IN THE AC ADAPTER TO REDUCE THE POSSIBILITY OF POWER SURGES WHICH CAN DAMAGE THE PCB. PROBING ON THE PCB SHOULD BE DONE WITH CARE USING PROPER ESD TECHNIQUES WHILE HANDLING. Hardware Description There are two components in the hardware portion of the evaluation platform. The daughtercard and the motherboard (Figure 1). The FDA and ADC are on the daughtercard, which accepts power from the motherboard and contains the analog input circuitry, clock interface, and supply decoupling. The daughtercard interfaces to the motherboard through a mezzanine connector. The motherboard contains a USB interface, an FPGA and SRAM. The motherboard serves as the interface between the host PC and the ADC daughtercard. Most of the ADC functionality is controlled through the motherboard by the Konverter software. The FPGA accepts output data from the ADC and buffers it to the SRAMs before passing it to the PC at the lower data rate required for post-processing. The maximum buffer depth is approximately one million words. The designer must supply a low jitter RF generator for the clock input to achieve the SNR reported here. Some possible options are shown in “Appendix A: Low Phase Noise RF Generators” on page 15. An alternate to a signal generator for fixed 500MSPS clock rates would be the 3.3V supply, SMA barrel, RFPRO33-500 from Crystek. A slight degradation in SNR might be expected using this device vs the best low phase noise RF signal generators and a bandpass filter on the clock. Using a bandpass filter on the clock will reduce clock jitter and improve SNR while using a bandpass on the signal source is normally required to eliminate harmonics while testing the board performance. Most RF generators that might be used as a test analog input source have very poor harmonic distortion and require a bandpass postfilter to see the full performance of the ADC’s FFT. Software Description The software component is the Konverter Analyzer, a graphical user interface (GUI) created with MATLAB™. A MATLAB Component Runtime engine is supplied, which executes a compiled version of the m-files. Therefore, a separate version of MATLAB is not required to run the Konverter Analyzer. The GUI controls the ADC configuration through its SPI port, reads data from the motherboard and performs the post-processing and display of digitized data. Data can be viewed in either the time or frequency domain, and can be saved for later processing. Critical performance parameters such as SNR, SFDR, ENOB, etc. are calculated and displayed on the screen when FFT output is selected and a dominant single frequency is being applied. Initial Start-Up Referring to Figure 3, connect the daughtercard to the motherboard by aligning the two matching mezzanine connectors. Four screws on the motherboard align with the mounting holes on the daughtercard. Next, connect the clock source (≈12dBm level into 50Ω) which will be required for communication to the Konverter software. Then connect a test source or signal of interest coming from your signal channel at a maximum input level <350mVP-P (or <-5.1dBm for single tone). With the RF signal generators delivering a clock and input signal to the daughtercard, and the +5V supply jack plugged into the motherboard, plug the AC power plug into a wall socket. The daughtercard is powered from linear regulators on the motherboard through the mezzanine connector. The USB cable should now be connected from the motherboard to the PC. Be sure to use the same USB port that was originally used when the Konverter software was installed on the PC to insure it is recognized. Now launch the Konverter software on the PC where it should recognize the motherboard and proceed to taking an FFT. Motherboard The only connections to the motherboard are the +5V supply power and the USB cable to the PC with the Konverter software loaded. No additional configuration of the motherboard is required. IT IS STRONGLY RECOMMENDED TO INSERT THE +5V PLUG AT THE MOTHERBOARD WITH THE DAUGHTERBOARD ATTACHED PRIOR TO PLUGGING IN THE AC ADAPTER TO REDUCE THE POSSIBILITY OF POWER SURGES WHICH CAN DAMAGE THE PCB. PROBING ON THE PCB’S SHOULD BE DONE WITH CARE AND PROPER ESD PROCEDURES USED WHEN HANDLING THE BOARDS. FIGURE 1. TYPICAL CHARACTERIZATION SETUP USING THE INTERSIL KMB-001 MOTHERBOARD AND KONVERTER SOFTWARE Low-Jitter RF Generator Clock Inputs Analog Input Low-Jitter RF Generator 10MHz Reference Mezzanine Connector USB To Host PC Analog Input Clock (200-500MHz) REF IN REF OUT Motherboard KMB001 USB +5V FPGA SRAM SRAM ADC Daughter Card Optional Attenuator AMP Optional Measurement Port Test Bandpass Filter |
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