Analog Devices EVAL-ADAQ23876FMCZ User Manual page 13

User Guide
SOFTWARE OPERATION
Waveform Tab
The Waveform tab displays results in the time domain, as shown in
Figure 18.
CAPTURE Pane
The Capture pane contains the capture settings, which reflect onto
the registers automatically before data capture.
The Sample Count pulldown menu in the General Capture Set-
tings section allows the user to select the number of samples per
channel per capture.
The user can enter the input sample frequency in kSPS in the
Throughput(ksps) field in the General Capture Settings section.
Refer to the ADAQ23876 or ADAQ23878
the maximum sampling frequency for the selected mode.
Click Run Once in the Device Settings section to start a data
capture of the samples at the sample rate specified in the Sample
Count pulldown menu. These samples are stored on the FPGA
device and are only transferred to the PC when the sample frame is
complete.
Click Run Continuously in the Device Settings section to start a
data capture that gathers samples continuously with one batch of
data at a time.
RESULTS Pane
The Display Channels section allows the user to select which
channels to capture. The data for a specific channel is only shown if
that channel is selected before the capture.
The Results section displays amplitude, sample frequency, and
noise analysis data for the selected channels.
Click Export to export captured data. The waveform, histogram,
and FFT data is stored in .xml files along with the values of parame-
ters at capture.
analog.com
EVAL-ADAQ23876/EVAL-ADAQ23878
data sheet to determine
The data Waveform graph shows each successive sample of the
µModule output. The user can zoom in on and pan across the
Waveform graph using the embedded waveform tools. Select the
channels to display in the Display Channels section.
Select Codes above the Waveform graph to select whether the
graph displays in units of Codes, Hex, or Volts. The axis controls
are dynamic.
When selecting either y-scale dynamic or x-scale dynamic, the
corresponding axis width automatically adjusts to show the entire
range of the µModule results after each batch of samples. Select
the dynamic using the XYDirection tool above the Waveform
graph.
Histogram Tab
The Histogram tab contains the Histogram graph and the RE-
SULTS pane, as shown in Figure
The RESULTS pane displays the information related to the dc
performance.
The Histogram graph displays the number of hits per code within
the sampled data. This graph is useful for dc analysis and indicates
the noise performance of the device.
FFT Tab
The FFT tab displays FFT information for the last batch of samples
gathered, as shown in Figure 20. The FFT tab also allows the
oversampling function with an oversampling rate (OSR) up to 256×,
as shown in Figure 21. Oversampling by a factor of four provides
one additional bit of resolution, or a 6 dB increase in the dynamic
range (DR) of the ADAQ23876 or ADAQ23878. In other words,
ΔDR = 10 × log10 (OSR) (in dB)
19.
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