UG-855 datasheet(18/29 Pages) AD

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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 sinc4

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:

The value in the Refin1(+/-) 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 Refin1(+/-) field accordingly. The

analysis results are based on the value set in this field.

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.

When the drop-down box is set to Continuous Run,

the software performs a continuous capture from the

ADC when SAMPLE is clicked.

Click Stop to stop streaming data.

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.

Figure 24. Example of the Waveform Tab After Running a Noise Test

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