UG-855
EVAL-AD7124-4SDZ User Guide
Rev. 0 | Page 18 of 29
NOISE TEST—QUICK START DEMONSTRATION
Click the
NOISE TEST
demo button to configure the device for
the noise test. The
AD7124-4
is now configured for the noise test
demo, where the output data rate is set to 9.38 SPS, with the sinc
4
digital filter, full power mode of operation, and the REFIN1(±)
external reference selected. Gain and offset are the default factory
values following a reset.
To gather samples, change the
Samples
field to the number of
samples required value, then click
SAMPLE
to acquire the
samples from the ADC. Figure 24 shows an example of the
main window after running a noise test.
Reading Samples from the ADC
The evaluation board is set up to use the external 2.5 V on-board
reference (
ADR4525
). To read samples from the ADC, take the
following steps:
1.
The value in the
/-)
field on the
Configuration
tab is set to 2.5 V by default to use the external 2.5 V on-
board reference (
ADR4525
). If a different reference is used,
set the value in the
/-)
field accordingly. The
analysis results are based on the value set in this field.
a.
When
Single Run
is selected from the drop-down list,
a batch of samples is read when
SAMPLE
is clicked,
with the batch size being set by the value in the
Samples
box.
b.
When the drop-down box is set to
Continuous Run
,
the software performs a continuous capture from the
ADC when
SAMPLE
is clicked.
c.
Click
Stop
to stop streaming data.
2.
Use the navigation tools within each graph to control the
cursor, zooming, and panning.
Waveform
The waveforms resulting from the gathered samples are shown
in this tab. The waveform graph shows each successive sample
of the ADC output (input referred). The indicators beside this
graph show the channels being converted. Navigation tools are
provided to allow the user to control the cursor, zooming, and
panning. The conversions can be displayed as codes or as volts.
Parameters such as peak-to-peak noise and rms noise are displayed
below the graph in the
Analysis
section for the current batch of
samples. If several analog input channels are enabled, each enabled
channel can be selected and the conversions on that channel
analyzed using
Analysis Channel
.
The conversion data can be saved in a text file from the
File
menu.
To save the data into an Excel file, right-click the waveform graph
and select
Export Data
from the drop-down list that appears. A
Save
dialog box displays, prompting the user to save the data to
an appropriate folder location.
133
04
-02
4
Figure 24. Example of the
Waveform
Tab After Running a Noise Test
Содержание EVAL-AD7124-4SDZ
Страница 21: ...EVAL AD7124 4SDZ User Guide UG 855 Rev 0 Page 21 of 29 13304 027 Figure 27 Schematic Power Supply ...
Страница 22: ...UG 855 EVAL AD7124 4SDZ User Guide Rev 0 Page 22 of 29 13304 028 Figure 28 Schematic Regulators ...
Страница 23: ...EVAL AD7124 4SDZ User Guide UG 855 Rev 0 Page 23 of 29 13304 029 Figure 29 Schematic SDP ...
