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ADS5410 EVM evaluation board not generating digital output

Peter Hahn
Prodigy 10 points

I have not been able to get my two ADS5410 EVM evaluation boards to work. As per SLAU082 User's Guide, all voltages, clocking signals and analog inputs have been applied. Both differential amp input and transformer coupled inputs were tested. Pin Jumper List was checked as per Tables 1-1 and 1-2. No digital output appears on J15.

Clocking source: Analog Discovery - Tested with a 10MHz sine wave and square wave
Analog signal source: Analog Discovery - various frequencies and voltage levels
Digital Acquisition Device: NI USB-6501
Data collection software: MATLAB R2015b with Data Acquisition Toolbox

Does anyone have reverences to further documents with troubleshooting advice?
Detailed wiring and setup drawings would be helpful.
  • 0
    TI__Guru* 78404 points
    Hello Peter,

    I will look into this and get back to you.

    -Kang
  • 0
    TI__Guru* 78404 points
    Peter,

    If you have applied clock, power supply, and input, the digital output should at least toggle according to the input frequency. Please advise your clock input power to see if they match the user's guide's 1Vpp to 6Vpp requirement.

    Please also disconnect the NI USB-6501. Make sure nothing is connected to the digital CMOS output port, and probe (on the scope) both the clock line and J15 CMOS output.

    CLKin = probe across R42 and check for signal quality
    J15 = make sure the probe is in High - z mode and check if any of the lines are toggling.
    The CMOS output format is in 2's complement, so chances are if the ADC is working, some bits are logic high and some bits are logic low. If all bits are logic low, I wonder if the device is not powered on correctly.

    Check the lines before and after the buffer U5. I hope the buffer U5 is active and did not malfunction in this case.

    Check the bandgap reference voltage when the ADC is enabled to see if the device is powered up correctly. Check the nodes at C44, C88, and C41.

    Also, does the input has sufficient input power to ensure the output are toggling? Placing the input near the device's full-scale input power would help.

    -Kang