Cirrus Logic CS5550 - Manual (Page 13)

CDB5550
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Note: When saving data, only the data channel being displayed on the plot will be saved to a file.
2.2.5.5. Zoom Button
This button allows the user to zoom in on the plot by selecting two points in the plot area. Press the Re-
store button to return to the normal data plot, or press the Zoom button again to zoom in even further.
2.3 Retrieving Saved Data From a File
The CDB5550 software allows the user to save data to a file, and retrieve it later when needed. To load
a previously saved file:
1) Pull down the Setup option and select Disk. A file menu will appear.
2) Find the data file and select it. Press the Select button to return.
3) Go to the Data Collection Window, and press the Collect button.
4) The data from the file should appear on the screen. To select a different file, repeat the procedure.
Note: Only time domain data can be loaded from a file. Data saved as FFT data or Histogram data cannot
be loaded. However, time domain data can be displayed as an FFT or histogram when reloaded.
2.4 Analyzing Data
The evaluation software provides three types of analysis tests - Time Domain, Frequency Domain, and
Histogram. The Time Domain analysis processes acquired conversions to produce a plot of Magnitude
versus Conversion Sample Number. The Frequency Domain analysis processes acquired conversions to
produce a magnitude versus frequency plot using the Fast-Fourier transform (results up to Fs/2 are cal-
culated and plotted). Also, statistical noise calculations are calculated and displayed. The Histogram anal-
ysis test processes acquired conversions to produce a histogram plot. Statistical noise calculations are
also calculated and displayed.