PDF CLC-CAPT-PCASM Data sheet ( Hoja de datos )

Número de pieza	CLC-CAPT-PCASM
Descripción	Data Capture Board Users Guide
Fabricantes	National Semiconductor
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No Preview Available ! www.DataSheet4U.com N CLC-CAPT-PCASM Data Capture Board User’s Guide October 2000 Section I. Introduction The CLC3790093 Data Capture Board enables simple evaluation of National Semiconductor’s High Speed Analog to Digital Con- verters (ADCs) and the Diversity Receiver Chip Set (DRCS). The Data Capture Board interfaces the outputs of these devices to the standard serial port available on the back of most Personal Computers (PCs). We have provided PC software to control the data capture function and Matlab® scripts for data analysis. Table of Contents I. Introduction II. Capturing Data from ADC Evaluation Boards III. Capturing Data from the DRCS Evaluation Boards IV. Data Analysis using Matlab Script Files A block diagram of the evaluation test bed is shown below. The Data Capture Board contains a ﬁeld-programmable gate array (FPGA) that controls its operation. An EPROM conﬁgures the FPGA after power is applied. The serial interface is provided by a UART (Universal Asynchronous Receiver/Transmitter), an oscillator, and a level translator IC. The captured data is stored in either three 32K x 8 static RAMs (organized into 24-bit words) or in a FIFO containing 32K 18-bit words. LEDs provide a visual indication of activity. DIP switches and a jumper conﬁgure several capture functions. DataSheet4U.com Section II. Capturing Data from ADC Evaluation Boards Getting Started To use the Data Capture board to capture data from a National Semiconductor Analog to Digital converter, you will need the following hardware, software, and documentation. DataShee National Semiconductor High-Speed Converter Evaluation Test Bed CLCXXXX A/D Converter Evaluation Board Digital Receiver Evaluation Board DataSheet4U.com © 2000 National Semiconductor Corporation Printed in the U.S.A. DataSheet4 U .com Data Capture Board http://www.national.com 1 page www.DataSheet4U.com Verify the connections and, if necessary, try the other COM port. (Note that you must have a clock applied to the ADC Evaluation board during this communication veriﬁcation stage. Check to make sure that either an external clock or the TTL oscillator is installed, and that LED6 is on at reduced intensity.) Once you get a proper exit from this step, you are ready to conﬁgure the capture board. Right click on the capture control panel, then left click on “Conﬁgure Capture.” You will see the following screen: “Default” and then on “OK”. If you do not have a C:\temp directory, please make one. The reason for this is that the Matlab script ﬁles for data analysis look automatically for the ﬁle C:\temp\data.dat. If you wish to store the data elsewhere, you will need to modify the Matlab m-ﬁles to look for your data ﬁle in a different location. Obviously, if you are using your own software for data analysis this is not a concern. Capture Data! We are ﬁnally ready to capture data from the ADC. As a ﬁnal check, you can move the mouse until it is on top of the progress bar (the big bar on the data capture control panel that now reads (0%). You should see a little yellow box appear that conﬁrms your capture settings. et4U.com Now, simply left-click on the “Start” button on the capture control panel to start the process. You will see LED 2 light up on the board, and the bar at the top of the capture control panel will show the progress of the data transfer. At 52MSPS, the 32768 samples are collected in only 630 microseconds; the rest of the time is the serial port trans- To conﬁgure the capture board for direct capture of a fer. Typical times for this transfer are on the order of 10 toDataShee contiguous 32k point record of ADC output codes, click 15 seconds. To analyze the data using the Matlab Mﬁles on the selections shown above. Left click on “DCaatapStuhreeet4Ut.hcaotmwe have provided, please start Matlab at this time. To Debug” and select “Upper 18 Bits.” The names of these include the provided script ﬁles in your Matlab path, type selections may seem rather cryptic when you are simply the following command at the Matlab command prompt: capturing ADC data. The label names are derived from functions in the DRCS and CLC5902, so they might >> path(path,’c:\nsc\mﬁles’) seem out of context for ADC capture uses. Don’t worry about the label names, just make sure you have selected Alternatively, you can change directories at the Matlab the modes as shown above. Then click on “OK.” prompt until this is the current directory. From the Matlab command prompt, type “analysis_menu”. This will bring One ﬁnal conﬁguration remains. You need to tell the up the following menu: program where to store your data. Right click on the capture control panel, then left click on “Change Data File.” You will see the following menu: By left clicking on the little box to the right of the text entry window, you can select any disk, directory, and ﬁle name that suits you. However, we recommend that you start with the default ﬁle name and location shown. Click on DataSheet4U.com DataSheet4 U .com 5 http://www.national.com 5 Page www.DataSheet4U.com From the Windows Start Programs menu, launch the Capture program (it’s inside the C:\nsc folder). Right click inside the Control Panel and select Conﬁgure I/O and click the appropriate PC COM port button. Next, right click inside the Control Panel and select Conﬁgure Capture. Select the following options: Mode = Capture; Bits =24; Channel = A; From = AOUT; 1st Bit = Capture 1st Bit; Phase = In Phase Only. Click “OK” and then click the Start button in the Control Panel to start the data capture. The progress bar should conclude in about 10 seconds. Launch Matlab. Use the Matlab path browser to include the analysis Mﬁles. The installed default path is: “c:\nsc\mﬁles”. Add this to the Matlab paths, save the directory ﬁle and exit the path browser. At the Matlab command line enter “analysis_menu”. A GUI will appear. Left click on the DRCS_Serial button to perform an FFT on the captured data. The FFT plot above and the analysis results highlight several setup issues. The poor SINAD (and correspond- ing ENOB) is due to phase jitter (spec’d as SSB Phase Noise) of the IF signal source (an HP8656 was used here). A better choice of signal synthesizer is the HP8644B, which yields a SINAD of about 60dB under the same conditions. The main portion of the noise power is contained in the carrier’s immediate sidebands (±5KHz). et4U.com Another point of interest is that there are several spectral lines about -75dBFS and 25KHz on fundamental. These have been traced either to the gsrioduendoflothoepDataShee DataSheet4Uc.creoamted by the PC serial interface. Both serial interface cables were connected while this data was being collected. Removing the cable to the DRCS will reduce the amplitude of these spurs. Some of the ground loop The menu disappears while the analysis routine is remains because of the required Capture Board’s serial running. The process takes 4 - 5 seconds on a 133MHz interface to the PC. PC and plots the results when ﬁnished. Section IV. Data Analysis Tools The FFT should report an input power of about -18dBFS. The Matlab scripts contained on the Evaluation Kit CDROM provide a convenient toolset for evaluation of 32768 Point FFT Analysis -20 National’s Diversity Receiver ChipSet (DRCS) and high speed ADCs like the CLC595x family. There are 4 FFT Pinput (dBFS) = -18.1087 routines and 1 Sine Histogram routine which can be -40 Output SINAD = 51.7058 called from a user interface menu, “analysis_menu”. Set -60 Output SFDR = 56.0663 the Matlab path and working directory to that of the -80 -100 THD (dBFS) = -100.7444 ∫ En floor = -69.448 “Mﬁles” provided on the Evaluation Kit CDROM. Run “analysis_menu” from the Matlab command window to open a graphical user interface. Each of the called FFT ENOB = 11.302 routines has its appropriate variables set prior to the data -120 analysis. These variables are explained in the adjacent -140 text and can be easily edited to adjust for a particular -160 2 4 6 8 10 12 Frequency x 104 application from Matlab’s script editor. There are also comments within the routines that highlight various analysis blocks. DataSheet4U.com DataSheet4 U .com 11 http://www.national.com 11 Page

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