CDB5541 Cirrus Logic Inc, CDB5541 Datasheet - Page 9

• Manufacturer Part Number: CDB5541
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5541

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: CS5541
• Features: RS-232 Serial Communication With PC, Chip Control And Data Capture, FFT Analysis
• Kit Contents: Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

tion: collect from file or collect from converter. To
collect from a file, a previously saved file from the
ComPorts->DISK menu bar option must be select-
ed. Once a file is selected, its content will displayed
on the graph when the COLLECT button is
pressed. If the user is collecting conversions from
the evaluation board to analyze, the appropriate
COM port must be selected. The user is then free to
collect the preset number of conversions (preset by
the CONFIG pop-up menu discussed below). No-
tice, there is a significant acquisition time differ-
ence between collecting from a file and collecting
from the evaluation board. Data can only be col-
lected from the evaluation board at the converter’s
current sampling frequency, and will take much
longer than retrieving previously collected data
from a file.
CANCEL: This button allows the user to exit from
the COLLECT algorithm during a collection. It is
recommended that the user reset the evaluation
board after pressing this button, so that the evalua-
tion board will stop collecting data and wait for the
next command.
OUTPUT: This button calls up a pop-up window
which allows the user to save the collected data set
to a file or print out the information on the screen.
Two printing options are available: printing only
the plot data, and printing the entire screen includ-
ing the calculated statistics for the current analysis
mode.
ZOOM: Pressing this button allows the user to
zoom in on a specific portion of the current graph.
To zoom, click on the ZOOM icon, then click on the
graph to select one corner of the desired Zoom area.
When prompted, click on the graph again to select
the opposite corner of the desired zoom area. Once
an area has been zoomed to, the printing functions
can be used to print a hard copy of that region. Click
on RESTORE when done with the zoom function to
display the entire data set graph. A region can also be
DS503DB1
magnified further by clicking on the ZOOM button
again.
RESTORE: Restores the display of the graph after
zoom has been entered. No matter how far in the
user has magnified the data plot, the RESTORE
button will return to the fully zoomed-out data plot.
TIME DOMAIN / FFT / HISTOGRAM Selector:
This pull-down menu selects between time domain,
frequency domain, and histogram mode to perform
and display the appropriate analysis of the data set.
CONFIG: Opens a pop-up panel (Figure 4) to con-
figure how much data is to be collected, and how to
process the data once it is collected. The following
are controls and indicators associated with the
CONFIG panel.
SAMPLES: Allows the user to select the number of
conversions to collect, between 16 and 32,768.
WINDOW: Used in the Power Spectrum Window
to calculate the FFT. Windowing algorithms in-
clude the Blackman, Blackman-Harris, Hanning,
5-term Hodie, and 7-term Hodie. The 5-term Hodie
and 7-term Hodie are windowing algorithms devel-
oped at Cirrus Logic. If information concerning
these algorithms is needed, call technical support.
AVERAGE: Sets the number of consecutive FFT’s
to perform and average.
LIMITED NOISE BANDWIDTH: Limits the
amount of noise in the converters bandwidth. De-
fault is 0 Hz.
OK: Accept the changes and close the window
2.3.1 Histogram Plots
The following is a description of the indicators asso-
ciated with Histogram analysis (Figure 6).
BIN: Displays the x-axis value of the cursor on the
Histogram. This represents the output code from the
part.
MAGNITUDE: Displays the y-axis value of the
cursor on the Histogram. This represents the num-
CDB5540 CDB5541
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