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Basic Test Procedure
Figure 4. TSW1200 GUI
2.5
ADS42xx Test Procedure
•
Switch on 5V power supply on ADC EVM. Verify source current is about 330 mA ± 30 mA with clock
and TSW1200 connected at EVM default (i.e., connected at 250MHz).
•
Connect clock signal at J19 through an appropriate BPF.
–
Adjust the signal generator amplitude output to 0.6Vrms to provide approximately 0.8 Vpp at J19
through a BPF with about 5 dB attenuation plus cable losses.
–
Use a high quality, low phase noise generator for this input to ensure proper device evaluation.
•
Connect input signal through an appropriate BPF at either J6 or J3 (Channel A or B, i.e., 170MHz).
–
Adjust frequency of generator to match the coherent frequency displayed in the TSW1200 GUI.
–
Select the proper Display Channel on the TSW1200 GUI software that corresponds to the input
connection.
–
Adjust the signal generator amplitude output to achieve –1 dBFS on FFT plot.
–
Use a high quality, low phase noise generator for this input to ensure proper device evaluation.
•
Initiate a capture by pressing the Capture button on the TSW1200 GUI.
7
SLAU333 – March 2011
ADS42xx EVM
© 2011, Texas Instruments Incorporated
