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ADC Data Capture Software Operation

Figure 7. TSW1400EVM Interfacing to an ADS5281 EVM

To setup the GUI to run in the data capture mode, click on the “ADC” tab in the top left side of the GUI.

Navigate to the device selection button located in the upper left side of the GUI, click on the drop down

arrow, then select “ADS5281”. After double clicking on this file, a pop-up will open asking “Do you want to

update the Firmware for ADC”. Click on “Yes”. The firmware will now start loading and take ~ 20 seconds

to complete. After the ADS5281 firmware load has completed, the FPGA_CONF_DONE LED will turn on

after the FPGA configured. The LEDs labeled USER_LED (0–7) will also be on except for USER_LED4.

NOTE:

If the TSW1400 is not receiving a valid clock from the ADC EVM, USER_LED3 will be off.

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Use the “Test Selection” button to change the capture display to Single Tone.

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Set the active channel setting to Channel 1/8.

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Use the default Record Length value of 65,536.

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Set the ADC Sampling Rate to 40 MHz.

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Click on the Auto Calculation of Coherent Frequency function and Rectangular capture mode if using a

coherent input frequency. Otherwise, do not set this and use "Blackman" windowing mode.

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Set the input frequency source to the new value in ADC Input Target Frequency that is generated by

the Auto Calculation of Coherent Frequency function.

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Make sure the display mode is set to “Frequency”.

13

SLWU079C – March 2012 – Revised January 2014

TSW140x High Speed Data Capture/Pattern Generator Card

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