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What is CLC-CAPT-PCASM?

This electronic component, produced by the manufacturer "National Semiconductor", performs the same function as "Data Capture Board Users Guide".


CLC-CAPT-PCASM Datasheet PDF - National Semiconductor

Part Number CLC-CAPT-PCASM
Description Data Capture Board Users Guide
Manufacturers National Semiconductor 
Logo National Semiconductor Logo 


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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.
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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
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© 2000 National Semiconductor Corporation
Printed in the U.S.A.
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Data
Capture
Board
http://www.national.com

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CLC-CAPT-PCASM equivalent
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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
verication 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 congure 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 les for data analysis look
automatically for the le C:\temp\data.dat. If you wish to
store the data elsewhere, you will need to modify the
Matlab m-les to look for your data le in a different
location. Obviously, if you are using your own software
for data analysis this is not a concern.
Capture Data!
We are nally ready to capture data from the ADC. As a
nal 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 conrms 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 congure 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 Mles
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 les 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. Dont 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 nal conguration 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 le name
that suits you. However, we recommend that you start
with the default le name and location shown. Click on
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5
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