CDB5460A Datasheet, PDF (17/28 Pages) Cirrus Logic – Evaluation Board and Software

CDB5460A
2.8.2 Collect Button
This button will collect data from the part, to be an-
alyzed in the plot area. See the section on Collect-
ing Data Sets for more information.
2.8.3 Config Button
This button will bring up the configuration win-
dow, in which the user can modify the data collec-
tion specifications. See the discussion of the Config
Window in this document.
2.8.4 Output Button
This button will bring up a window in which the
user can output the data to a file for later use, print
out a plot, or print out the entire screen.
Note: When saving data, only the data channel be-
ing displayed on the plot will be saved to a file.
2.8.5 Zoom Button
This button allows the user to zoom in on the plot
by selecting two points in the plot area. Press the
Restore button to return to the normal data plot, or
press the Zoom button again to zoom in even fur-
ther.
2.8.6 Channel Select Buttons
Depending on the number of channels of informa-
tion that has been collected, between 1 and 3 chan-
nel select buttons will appear below the graph,
allowing the user to choose the appropriate channel
for display. In the Time Domain mode, an addition-
al button labeled "Overlay" will be present, to al-
low the user to display all of the channels on the
same plot.
2.9 Config Window
The Config Window allows the user to set up the
data collection and analysis parameters.
2.9.1 Number of Samples
This box allows the user to select the number of
samples to collect, between 16 and 8192. Due to
memory size on the CDB5460A, the maximum is
4096 samples when collecting two channels, and
2048 samples when collecting three channels.
2.9.2 Average
When doing FFT processing, this box will deter-
mine the number of FFTs to average. FFTs will be
collected and averaged when the Collect button is
pressed.
2.9.3 FFT Window
This box allows the user to select the type of win-
dowing algorithm for FFT processing. Windowing
algorithms include the Blackman, Blackman-Har-
ris, Hanning, 5-term Hodie, and 7-term Hodie. The
5-term Hodie and 7-term Hodie are windowing al-
gorithms developed at Crystal Semiconductor.
2.9.4 Histogram Bin Width
This box allows for a variable "bin width" when
plotting histograms of the collected data. Each ver-
tical bar in the histogram plot will contain the num-
ber of output codes contained in this box.
Increasing this number may allow the user to view
histograms with larger input ranges.
2.9.5 Pages to Collect
This box determines the number of data "pages"
that the microcontroller will collect before sending
data to the PC. Each page consists of the number of
samples collected, and only the last page will be re-
turned to the PC for processing. This function is
useful at higher sampling frequencies to minimize
board-level noise at the beginning of the conver-
sion set.
2.9.6 Data to Collect
These six check boxes allow the user to select the
data channels that will be collected and returned to
the PC for processing. Up to three channels can be
selected at once. There are some restrictions on the
speed and number of samples to collect when se-
lecting more than one channel. A warning message
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