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Posts posted by OscarBarajas

  1. Hi @Attila sorry about the delay, I had no access to an oscilloscope until today, so I checked and the Minus 5.5V is reading 1.07V, the PLUS 5.5V is working fine,

    both 3.3V and -3.3 are working. 

    How can I make the -5.5V work again? where is the negative power supply IC on the board?


    Also, when I trace the input waveform past the first variable cap (on pin 3 of the gain selector) all I get is a 600mV DC signal, and I dont understand why. But first things first, lets fix the -5.5V rail.

  2. Dear attila, I have ran that test with and without the bnc adapter multiple times with no luck. The AWG is correclty calibrated as confirmed in the screenshots. Please find a screenshot of waveforms so you trust me the AWG is running, the connections are fine too.


    It seems like no input is getting into the scope channels, so I'm guessing the issue is somewhere on the input circuitry, but I need help troubleshooting and testing. I read some people have replaced the Multiplexer to get the scope working again but I dont know if that's what I have to do or not, I'd need more info such as layout pics or general direction.




  3. Quote

    The USB socket on AD1 can be broken with bad quality cables or by forcing it. Luckily this is no more an issue with AD2.
    In case someone needs to repair AD1 usb, below can find a post with details/PCB.

    Hi attila, I was hoping you answered, I have already replaced the USB port, fortunately only the data pins lifted so i didnt have to make any bridges under the connector. I also already found a couple long cables that work.

    I have tripple checked the connections and coupling with and without the BNC adapter, but I get the following oscilloscope calibration results *AWG is spot on after calibration. I also make sure the AWG channels are running when trying to measure them.

    Please find the calibration results and error prompt atached.






    Calibration error.png

  4. I recently re-soldered the USB connector on my legacy analog discovery, since the d+ and d- pads got lifted, I also had to scrape the silkscreen on the tiny the traces that go to the FTDI chip and painstakingly bridged  them using tiny isolated wire I got from an old data cable.

    The AD was working just fine before the micro USB was damaged, but now I'm running into some issues:

    When using short cables I get a DptilO failed ERC:7 Device configuration failed (PLL 3). I solved it by using use a LONG cable and now it to be recognized and programed correctly, which is counter intuitive as supposedly a PLL error means the AD needs more power, so a longer cable would make that worse. 

    Now, when testing it with the latest version of waveforms, it seems like everything works BUT the oscilloscope, I can only see the noise floor when selecting a small enough vertical range, I have tested both channels of the AWG with a benchtop oscilloscope and they work just fine, the power supply works too, the audio out works as well.

    It seems something happened to the Oscilloscope input channel stages, but I don't know where to look on the board or what to test for, can someone help me with the schematics/ layout or expected test values of the relevant part of the board? I am a graduate student and I can't spend another 180 dollars in a new AD, I'd rather give it a shot at replacing some components and fixing it myself, I do have a very cheap usb microcope and a rather decent SMT soldering station.


  5. Hi all, 

    We are a small startup looking for an pga development platform. We need a fast ADC/DAC FMC board and right now we're looking at the fmc163 from abaco https://www.abaco.com/products/fmc163-fpga-mezzanine-card. The board needs an FMC connector that conforms to the ANSI/VITA57.1 standard. I called Abaco and they confirmed it works with the Xilix KC705 kit https://www.xilinx.com/products/boards-and-kits/ek-k7-kc705-g.html via this adapter https://dedicatedsystems.com.au/products/fmc700/ but couldn't confirm compatibility with the genesys2 board directly. I couldn't find any information as to if the genesys2 actually supports high speed ADC boards through the vita57.1 connector or not.  Given that both boards seem to use the exact same FPGA (XC7K325T-2FFG900C) It is very important for me to know if it will work. Thank you.