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ADC12J4000 Temperature LED and GUI indicators

Maxime Drouguet
Prodigy 30 points
Other Parts Discussed in Thread: LMX2581, ADC12J4000EVM, LM95233, LMK04828, ADC12J4000

Dear Sir/Madam

I'm working with the ADC12J4000EVM (the former version, with the LMX2581 Synthesizer) and the TSW14J56 (rev B). I use external clocking to reach 4GSPS and I also use the timestamping function.

Everithing worked fine until a few days ago. Now I always got a time out error in HSDC (I didn't touch the hardware in between exept the power switches).

I am currently trying to find the issue looking at some indicator in the ADC GUI and on board but I don't remember what was the state of those indicators when the system was working. So my questions are :

-The temperature monitor circuit lite the TCRIT1 LED. Is it normal or does that mean that my ADC is dead?
-In the control tab of the ADC GUI "ADC Operational" is off. Is it normal ? Should I look somwhere in the GUI to find more information?
-Do you have any clue to explain such a failure?

NB:
-The ADC still seems to run since I got some blinking of the Over-range Thresholds when the external clocking is set.
-Also the clock seems to reach the FPGA since leds 2 and 4 are blinking.
-The ADC is quite hot, it hurts to keep a finger on it.  
-It really looks like when I had sync issue e2e.ti.com/.../1742154

Yours sincerely,

Maxime D.

  • 0
    TI__Mastermind 44680 points

    Hi Maxime

    Were any software changes (updated version of High Speed Data Converter Pro, etc.) made?

    The LM95233 temperature sensor IC on that board cannot be used due to an error in the design of the serial interface circuitry. The TCRIT1 LED will always be illuminated whether the board is working or not.

    If you are using external clocking mode I would recommend you double check all of the components that were changed to enable that usage. A marginal solder joint may have opened up and be preventing proper delivery of the CLK inputs to the LMK04828 or ADC12J4000 devices. I would also recommend you double check that your RF generators providing these clocks are still properly frequency locked. If they are not locked, or are not at the proper frequencies (4 GHz and 2 GHz) then that will also cause a problem.

    If the ADC is properly configured and operating at 4 GHz it will get reasonably hot. At 4 GHz clocking, steady state and normal room temperatures, the ADC is at 57 degrees C in my newer version bench EVM.

    Let me know how debug goes.

    Best regards,

    Jim B