Rev 03 Jun 2015 18:39 | Page 14
Figure
12. Graph Window of VisualAnalog
Click the floppy disk icon within the VisualAnalog Graph - AD9266 FFT window to save the
2.
performance data as a .csv formatted file for plotting or analysis.
Troubleshooting Tips
Lack of SPI communication causes difficulty in configuring the ADC.
Go to the Global tab of the SPIController window and push the Read button in the CHIP ID(1)
●
window. If “Unknown” appears in the CHIP ID field, the part might not be powered up, or SPI
communication might not be working.
Check that there is correct power to the
or
board and to the
●
.
Check that the USB cable is properly connected from the PC to the
●
The LED on the VisualAnalog ADCDataCapture block should be green. If it is red, push the USB
●
button on the same block to refresh the connection.
If the FFT plot appears abnormal, do the following:
If you see an abnormal noise floor, go to the ADCBase0 tab of the SPIController window and
●
toggle the Chip Power Mode in MODES(8) from Chip Run to Reset and back.
If you see a normal noise floor when you disconnect the signal generator from the analog input, be
●
sure that you are not overdriving the ADC. Reduce the input level, if necessary.
In VisualAnalog, click the Settings icon in the Input Formatter block. Check that Number
●
Format is set to the correct encoding (offset binary by default). Check that the Number Format in
