CDB5521 datasheet(13/28 Pages) CIRRUS

13 / 28 page

CDB5521/22/23/24/28

DS317DB2

2. PART II: SOFTWARE

2.1 Installation Procedure

To install the software:

1) Turn on the PC, running Windows 95TM or lat-

er.

2) Insert the Installation Diskette #1 into the PC.

3) Select the Run option from the Start menu.

4) At the prompt, type: A:\SETUP.EXE <enter>.

5) The program will begin installation.

6) If it has not already been installed on the PC,

the user will be prompted to enter the directory

in which to install the CVI Run-Time En-

gineTM. The Run-Time EngineTM manages exe-

cutables created with Lab Windows/CVITM. If

the default directory is acceptable, select OK

and the Run-Time EngineTM will be installed

there.

7) After the Run-Time EngineTM is installed, the

user is prompted to enter the directory in which

to install the CDB55521/22/23/24/28 software.

Select OK to accept the default directory.

8) Once the program is installed, it can be run by

double clicking on the Eval5522 icon, or

through the Start menu.

Note:

Thesoftwareiswrittentorunwith640x480resolution;

however, it will work with 1024 x 768 resolution.

If the user interface seems to be a little small,

the user might consider setting the display

settings to 640 x 480. (640x480 was chosen to

accommodate a variety of computers).

2.2 Using the Software

At start-up, the window Start-Up appears first (Fig-

ure 5). This window contains information concern-

ing the software’s title, revision number, copyright

date, etc. Additionally, at the top of the screen is a

menu bar which displays user options. Notice, the

menu bar item Menu is initially disabled. This

eliminates any conflicts with the mouse or concur-

rent use of modems. Before proceeding any further,

the user is prompted to select the serial communi-

cation port.

To initialize a port, pull down option

Setup from the menu bar and select either COM1 or

COM2. After a port is initialized, it is a good idea

to test the RS-232 link between the PC and the

evaluation board. To do this, pull down the Setup

menu from the menu bar and select the option

TESTRS232. The user is then prompted to set the

evaluation board’s test switches to 011 and then re-

set the board. Once this is done, proceed with the

test. If the test fails, check the hardware connection

and repeat again. Otherwise, set the test switches to

000 (normal mode) and reset the board. The option

Menu is now available and performance tests can

be executed.

The evaluation software provides three types of

analysis tests - Time Domain, Frequency Domain,

and Histogram. The Time Domain analysis pro-

cesses acquired conversions to produce a plot of

Conversion Sample Number versus Magnitude.

The Frequency Domain analysis processes ac-

quired conversions to produce a magnitude versus

frequency plot using the Fast-Fourier transform

(results up to Fs/2 are calculated and plotted). Also,

statistical noise calculations are calculated and dis-

played. The Histogram analysis test processes ac-

quired conversions to produce a histogram plot.

Statistical noise calculations are also calculated and

displayed (see Figures 4 through 9).

The evaluation software was developed with Lab

Windows/CVITM, a software development package

from National Instruments.

More sophisticated

analysis software can be developed by purchasing

the development package from National Instru-

ments (512-794-0100).

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