Datasheet
EVAL-AD7262/AD7264
Rev. 0 | Page 11 of 20
USING THE SOFTWARE
MENU BAR
The menu bar consists of the following items: File, Edit,
Operate, To ol s , Window, and Help.
PART INFORMATION SECTION
The Part Information section allows you to select the following
configuration options:
• Part Number: AD7264 or AD7262; the software auto-
matically sets the resolution to 14 or 12 bits, respectively.
• Sampling Frequency: The maximum sampling frequency
supported by the EVAL-AD7262/AD7264 is 1 MSPS.
• PGA Gain: The drop-down menu allows you to select
the required AD7264 or AD7262 PGA gain setting. The
AD7264 or AD7262 allow you to select PGA gains from
1 to 128.
• Power-On Setting: You can select the desired power on or
off configuration by selecting to power on either, ADC A,
B; Comp A, B; Comp C, D.
• Initiate a Calibration: A calibration of the AD7264 or
AD7262 can be initiated by clicking Cal.
The Part Information tab also includes a Busy status indicator,
which lights 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, the user can select the number of
samples to be captured from the drop-down menu. The
default number of samples is 4096; you are free to change
this as required. The desired display option is selected by
clicking any one of the Wavefor m, Histogram, or FFT tab.
Waveform Tab
The Wavefo rm tab displays a digital storage oscilloscope
(DSO) that allows you to display a waveform. Samples are
displayed here when uploaded from the EVAL-CED1Z
board. The samples are displayed as integer code values.
At the bottom left of the graph are the zoom options. These
allow you to zoom in and out to get a closer look at a sample.
The Waveform Analysis section, which is located beneath the
waveform graph, contains information about the samples taken;
for example, minimum/maximum position or velocity, 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 bottom right hand side of the graph, labeled ChanA On/
Off and ChanB On/Off are used to select which ADC’s data is
displayed. An indicator, located on the top right hand corner of
the graph, shows what color graph represents each ADC when
the data from both ADC’s is displayed.
Histogram Tab
The Histogram tab displays a histogram of the captured ADC
codes. It can be used to give an indication of the performance
of the ADC in response to dc inputs. The Histogram Analysis
section contains information about the samples taken; for
example, maximum and minimum codes captured.
FFT Tab
The FFT tab displays an fast Fourier transform (FFT) plot.
The FFT is typically used for examining the performance of
the ADC in the frequency domain. The Spectrum Analysis
section contains information about the samples taken, such
as ac specifications (see Figure 3).
You can choose whether to display the information for ADC A,
or ADC B, or both in the window using the ChanA On/Off and
ChanB On/Off buttons, as explained in the Wave for m Tab section.
LINEARITY TAB
In the Linearity tab, you can select the number of hits per code
to be captured for the linearity analysis. The desired display option
is selected by clicking the Histogram, INL, DNL, or Summary
tab. To initiate the data collection, select the Get Linearity Data
button. The data collection and analysis takes a few seconds to
complete. The greater the number of hits per code selected, the
longer the analysis takes.
Histogram Tab
The Histogram tab displays a histogram of the captured ADC
codes. It can be used to give an indication of the performance
of the ADC in response to dc inputs. The Histogram Analysis
section contains information about the samples taken, for
example, maximum and minimum codes captured.
INL Tab
The INL tab displays an INL plot for the AD7262 or AD7264.
This plot can be used to examine the dc performance of the
ADC. The Linearity Analysis section contains information
on the maximum and minimum INL error and the code at
which this error occurred. It also shows the total number of
hits per code and the number of samples taken.
DNL Tab
The DNL tab displays a DNL plot for the AD7262 or AD7264.
This plot can be used to examine the dc performance of the
ADC in conjunction with the INL plot. The Linearity Analysis
section contains information on the maximum and minimum
DNL error and the code at which this error occurred. It also
shows the total number of hits per code and the number of
samples taken.
Summary Tab
The Summary tab displays the INL/DNL/histogram plots and
results in the same place for convenient analysis.