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EC1 Transition: Not applicable
FFT Data Write (FFT Plot Only): Writes the calculated FFT
data to a file
Bin Boundaries (FFT Plot Only): Highlights the bins used to
calculate the fundamental and harmonic energy. Configure the
Fundamental Leakage and Harmonic Leakage under Config >
FFT. See the Configuring an Evaluation Board section for more
information
FFT Bins: Changes the X-axis of the graph from frequency to
bins
IMPORTING DATA
Data can be imported to ADC Analyzer to perform an FFT
calculation. Two types of data can be imported: raw time
domain text data in decimal format (from a logic analyzer, for
example) and data exported from ADC Analyzer.
Note that when importing data, double-check to make sure that
the number of bits, sample size, and digital format (Twos
Complement vs. Offset Binary) are selected appropriately under
the Config menu.
To import data previously exported from ADC Analyzer:
1.
Choose File > Import Data.
2.
Enter the file path in the dialog box shown in Figure 9, or
click the Browse... button to search for the file. Click OK.
3.
The time-domain data is graphed in a new window. Right
click the graph to open the hidden menu. Choose Lock
Data from the menu. See Figure 7 in the Zooming and
Exporting Data section.
4.
To perform an FFT on this data, click the FFT button.
To import raw time domain text data in decimal format:
1.
Choose File > Import Data.
2.
Click the ASCII File button shown in Figure 9.
3.
The window in Figure 10 opens. This window is used to
give ADC Analyzer information about how to interpret the
text data file. If any of these input parameters are not
correct, both the time and FFT data will not be correct.
Data Bits: Select the resolution of the ADC.
Samples: Select the number of samples in the file.
Data Format: Select the format of the ADC output data.
Justification: Normally, the data exported from ADC Analyzer
is MSB_Justified. When importing data, be sure to select the
proper justification.
HSC-ADC-EVALA-SC/HSC-ADC-EVALA-DC
Encode Frequency (MHz): Enter the sampling clock rate used.
ASCII Text File to Import: Click the Browse... button to
search for the file.
4.
Click OK. The time-domain data is graphed in a new
window. Right click the graph to open the hidden menu.
Select Lock Data from the menu. (See Figure 7.)
5.
To perform an FFT on this data, click the FFT button.
.csv and ASCII files
The Comma Separated Value or Comma Delimited file format
(.csv) is displayed in Figure 11 using Microsoft Excel. The .csv
file includes extra parameters, including the raw time domain
data.
Rev. 0 | Page 19 of 44
Figure 9. Import Data Dialog Box
Figure 10. Import ASCII Text File Dialog Box
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