Datasheet

EVAL-AD7352/AD7356/AD7357
Rev. 0 | Page 9 of 16
SOFTWARE OPERATION
With the hardware set up, you can now use the software to
control the EVAL-CED1Z and the AD7352/AD7356/AD7357
evaluation board. To launch the software, select the AD735x
submenu from the Analog Devices menu and then click the
AD735x icon. Figure 3 displays the main window that opens. If
an error message appears, click OK and restart the application
after checking the connection between the adapter board and
the USB port on the PC. In addition, check that the USB device
is identified by the Device Manager, as detailed in the Setting
Up the EVAL-CED1Z section.
The software that controls the AD7352/AD7356/AD7357
evaluation board through the EVAL-CED1Z has four main
sections. Figure 3 shows the window that appears when the
software is run. The top portion of the window contains the
menu bar. The Part Information section is on the left side of
the window. The Data Capture and Linearity tabs are in the
center of the window, and each consists of a number of subtabs.
USING THE SOFTWARE
Menu Bar
The menu bar consists of the following menus: File, Edit, and Help.
File Menu
Open (Sample Data)
Opens the sample data that has already been saved.
Save (Sample Data)
Saves the sample data that is currently displayed.
Open (Linearity Data)
Opens the linearity data that has already been saved.
Save (Linearity Data)
Saves the linearity data that is currently displayed.
Print Front Panel Picture
Prints the software window that is currently displayed.
Save as Picture
Saves the displayed window plot (that is, waveform, histogram,
FFT).
Exit
Closes the software.
Edit Menu
Reinitialize Values to Default
Reinitializes all controls in the main window to their default values.
Help Menu
Open analog.com
Opens the www.analog.com website.
Part Information Tab
The Part Information tab allows you to select which evaluation
board to use. The sampling frequency for the selected part is
changeable. The maximum sample rate is 3 MSPS for the AD7352,
5 MSPS for the AD7356, and 4.2 MSPS for the AD7357. The SCLK
frequency is set at 80 MHz for the AD7356 and AD7357 and at
48 MHz for the AD7352. Changing the sampling frequency
changes the throughput rate, but does not change the SCLK
frequency. The samples taken are uploaded and displayed.
The Part Information tab also includes a Busy status indicator
that illuminates when the evaluation board is busy and an EXIT
button to allow you to quit the program.
Data Capture Tab
In the Data Capture tab, you can select the number of samples
to be captured from the drop-down box. The default number
of samples is 4096; you are free to change this as required. To
initiate a conversion and capture the sample data, click Sample
or Continuous. Both of these buttons are located at the top
right corner of the Data Capture tab. When you click Sample,
the software instructs the EVAL-CED1Z board to take the
required number of samples at a specific frequency from the
evaluation board.
The samples taken are then uploaded and displayed. An FFT
and/or histogram can be calculated and displayed. If you click
Continuous, the software repeats the process indefinitely until
you click Stop. (The Continuous button switches to Stop when
clicked.) You can switch among displaying data from ADC A,
ADC B, or both while the software is running continuously. The
desired display option is selected by clicking the Wave form ,
Histogram, FFT, and Summary subtabs.
Waveform Tab
The Wav eform tab displays a digital storage oscilloscope (DSO)
that allows you to display a waveform. When samples are uploaded
from the EVAL-CED1Z, they are displayed here. The samples
are displayed as integer code values.
At the bottom right of the graph are the zoom options. These
allow you to zoom in and out for a closer look at a sample, if
required. The Waveform Analysis section, which is located
beneath the waveform graph, contains information about the
samples taken, for example, the minimum/maximum position
or frequency, the spread, the standard deviation, and the mean.
The waveform graph displays the information for both ADC A
and ADC B or either ADC as desired. Two buttons located on the
right side of the graph, labeled VA ON / O F F and VB ON/OFF
are used to select which ADC’s data is displayed. An indicator,
located on the top right corner of the graph, shows what color
graph represents each ADC.