Using The Software; Configuration Tab; Data Capture Tab; Taking Samples - Analog Devices EVAL-AD7928SDZ User Manual

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Evaluating the

USING THE SOFTWARE

CONFIGURATION TAB

The configuration tab contains control to configure the
AD7606. Options available to the user are Sampling Rate,
oversampling, range, and convert start pulse width.
Sampling rate
This control is used to increase the rate of convert start pulses
to the AD7606. The control will accept values from 769-200000
Hz. If oversampling is enabled the maximum limit of sampling
is decreases.
Oversampling
The oversampling checkbox is used to enable and disable
oversampling and choose from rates of oversample by 2, 4, 8,
16, 32 & 64. See the datasheet for more information on the
digital filter profile. The maximum output datarate of the
AD7606 is limited by the selected oversampling rate
Range
The range check box is used to alter the signal analysis
calculations for the Histogram, Waveform, and FFT windows.
The range pin is not hardwired to a GPIO pin. The range is
selected by inserting either R1 or R2 resistor to tie the pin to
DGND or VDRIVE. The default range is ±10V.
Convst
The Convst control is used to vary the convert start pulse width.
This is set to 50ns default.

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 Waveform, Histogram, or FFT tab.
Waveform Tab
The Waveform tab displays a digital storage oscilloscope
(DSO) that allows you to display a waveform. Samples are
displayed here when uploaded from the
board. The samples are displayed as integer code values.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
AD7606 16-Bit simultaneous sampling, 8-Channel, SAR ADC
EVAL-SDP-CB1Z
Rev. PR.A| Page 11 of 13
EVAL-AD7928SDZ User Guide
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 all 8 input
channels or as many channels as desired. Eight buttons located
to the right hand side of the graph, labeled ADC 1 On/ Off to
ADC 8 On/Off are used to select which channel's data is
displayed. An indicator, located beneath the graph, shows what
color graph represents each channel when the data from several
channels 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 12).
You can choose whether to display the information for one,
several or all eight channels in the window using the ADC 1
On/ Off to ADC 8 On/Off buttons, as explained in the
Waveform Tab section.

TAKING SAMPLES

To initiate a conversion and capture the sample data, click the
Sample button or the Continuous button. Both the Sample
and the Continuous buttons are located on the top right hand
corner of the Data Capture tab. When you click the Sample
button, the software instructs the EVAL-SDP-CB1Zboard to
take the required number of samples at the required frequency
from the evaluation board. The EVAL-AD7606 runs with
sampling speeds less than or equal to 200 kSPS. You can choose