Run the Demonstration

Table of Contents

1. Signal source
2. Run the demonstration

Signal Source

A signal generator with 2 outputs is used to generate the differential signals driving the AD40xx inputs. The AD4020, in its default configuration, requires the input signal to be centered around 2.5V.

• Set up the first channel to generate the desired signal
• Set up the second channel for tracking the first channel
• Set up the Second channel for signal inversion.
• Offset the Common mode voltage with 2.5V. Connect a 2.5V source to the VCM pin header on the AD40XX board.

Show picture of VCM header here.

Run the demonstration

Power up the unit using this hardware configuration. Wait approximately 60 seconds for the unit to be fully functional.

IIO Oscilloscope will be automatically launched on the system desktop. No configuration is required.

Enable voltage0 ADC channel

Select a Plot Channel to be displayed in IIO Oscilloscope. Click on the check box in the Plot Channel window adjacent to voltage0

Capture Time Domain Signals

Press the Capture / Stop button to begin the capture process. After viewing the waveform press the button again to stop the capture.

Capture Frequency Domain Signals with Frequency Markers enabled

Change the capture mode to Frequency Domain. Select an FFT Size and Average. Press the Capture / Stop button to begin the capture process. An FFT is continuously plotted. Note that larger FFT sizes provide a higher resolution but the screen updates more slowly. The x-axis is labeled “MHz” in the top right corner and the maximum frequency depends on the sampling frequency which is independent of the selected FFT size. After viewing the FFT press the button again to stop the capture.

Right click in the IIO Oscilloscope plot area. Select a marker option. Press the Capture / Stop button to begin the capture process with markers.

Note the information in the Marker window. This capture shows a signal source of 100 khz with harmonic components.

Shutting down the demo

• Power down the target. Launch a Root Terminal. Type the following

    $ poweroff  
  

• Wait 30 seconds and then you can safely power down the DataStorm DAQ

Return to - Add FMC interface support to the GSRD