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ADS1282EVM-PDK: Problems using the evaluation board in Bipolar Mode and installing the drivers to use it with ADCPro

Hiago Santos da Gama
Prodigy 230 points

Part Number: ADS1282EVM-PDK

Hello,

I am currently trying to use the ADS1282EVM-PDK in the bipolar mode, following the user's guide (www.ti.com/.../sbau144d.pdf) to power the board through an external supply (a laboratory power supply). I connected the +10V, -10V, GND and -5V on the J14 terminal and disconnected jumper J12. According to the user's guide, It is not necessary to connect a +5V dc supply voltage to the +5VA terminal on J14 if the +5V/+5VA position on J13 is shorted, in case the bipolar mode is being used. Still, the board didn't turn on. Here is a picture of the board and its connections: 

 

When I changed the configuration to unipolar mode (using +5V instead of -5V), the board turned on, but when I connected it on the PC it wasn't recognized by the system (windows 10). I had previously installed the ADCPro and ADS1282EVM-PDK-SW software and I was expecting that plugging the board on the computer would trigger the driver installation, just as it's shown in the user's guide, but it didn't happen. When I execute the ADCPro and select ADS1282EVM in the EVM tab, it displays "EVM/HW Incompatible".  

I would like to know how to make the board work in bipolar mode and if there is another software besides ADCPro and ADS1282EVM-PDK-SW that is needed in order to make the ADS1282EVM-PDK work with ADCPro. Is there any driver available so I can install it manually?

Thanks in advance,

Hiago Gama.

  • 0
    TI__Guru**** 178831 points
    Hi Hiago,

    I am sorry to hear that you are having trouble with this ADS1282 setup. Do any portions of the 8-segment LED on the MMB0 light up during the launching of the ADCPro software?
  • 0 in reply to Tom Hendrick
    TI__Mastermind 44670 points

    Hi Hiago,

    Unfortunately, ADCPro isn't supported to work with Windows 10. However, I've seen some people get it to work though:

    https://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/609939/2245716#2245716

    The two work around solutions that seem to help are:

    1. Disable Windows 10 Driver Signature Enforcement and reinstall the MMB0 driver (located in the "C:\Program Files (x86)\ADCPro\MMB0 Driver" directory)
    2. If reinstalling the above drive (with driver signature enforcement disabled) doesn't work, sometimes updating the NI-VISA driver has helped.

     

    Best regards,
    Chris

  • 0 in reply to Christopher Hall
    Prodigy 230 points

    Hi, Chris.

    Reinstalling the MMB0 driver after disabling windows 10 driver signature enforcement solved my problems with ADCPro. Now the board is recognized and ADCPro is able to connect to it. Thank you for your assistance! 

    Can you help me with the bipolar mode of the ADS1282EVM-PSK? I have made the changes that the datasheet pointed out in order to make it work in the bipolar mode, but the board simply didn't turn on. Can you help me checking what should be done in order for it to work properly? 

    Thank you for your patience,

    Hiago

  • 0 in reply to Tom Hendrick
    Prodigy 230 points
    Hi Tom,

    After reinstalling the MMB0 driver following the steps given by Chris, the board was recognized by windows and I was able to connect the ADCPro with it. The 8-segment LED on the MMB0 displays "2.". Now I am trying to make the evaluation board work in the bipolar mode. Do you have any insights that could help me doing that?

    Thank you for your help!

    Hiago
  • 0 in reply to Hiago Santos da Gama
    TI__Guru**** 178831 points
    Hi Hiago,

    Can you let us know how you have the jumpers setup on the MMB0 as well as what power supplies you have connected to the screw terminals at J14?
  • 0 in reply to Tom Hendrick
    Prodigy 230 points

    Hi Tom,

    At first, I was using the screw terminal (J14) to supply +10V, -10V, -5V and GND using a laboratory power supply. The +5V / +5VA on J13 was jumped, so I didn't think I needed the +5v supply. After the board failed to turn on, I decided to add the +5V supply to the MMB0 and it turned on. Is the board already working in the bipolar mode by just supplying it with both +5V and -5V? I ran some tests using a function generator and the ADC seems to be ok, I just don't know for sure if I am already operating in the bipolar mode. The jumpers on the board are in the same positions as they came from the factory, only the jumper in J12 was removed so the board could be supplied by J14.

    Thank you for your patience,

    Hiago

  • 0 in reply to Hiago Santos da Gama
    TI__Guru**** 178831 points
    Hi Hiago,

    Yes - you still need the +5V, you should be up and running in bipolar mode now!
  • 0 in reply to Tom Hendrick
    Prodigy 230 points
    Thank you for the help, Tom!

    Once you told me that the board should be running in the bipolar mode, I ran some tests using a function generator to simulate a sinuidal signal to the ADC. When I read the values with the SDCPro, they didn't match the signal I was simulating. Actually, the signal read by the ADC was the same as when the function generator was turned off.

    When I unplugged the -5V, turning the board to unipolar mode, I was able to read a positive constant signal just fine. The point is that I need the ADS1282 to work with a geophone that can send both positive and negative voltages, that's why I wanted to use the evaluation board in the bipolar mode.

    The evaluation board is simply not working in the bipolar mode, using J14 to supply the board with +5v, -5v, +10v, -10v and GND. It seems like the ADC voltage reference is not right, so the signals that I send can't be read by the ADC. Can you send me any information that could help me set the evaluation board to the bipolar mode?

    Best regards,

    Hiago
  • 0 in reply to Hiago Santos da Gama
    TI__Mastermind 44670 points
    Hi Hiago,

    What was the amplitude of the input sine wave and what results were you seeing in ADCPro? Were the output codes clipping?

    Keep in mind that the ADS1282 can only measure signals of amplitudes up to: "VREF / (2 * PGA)". Therefore, at a gain of 2 V/V, and a reference voltage of 5V, the maximum amplitude is 1.25V, for example.

    Best regards,
    Chris
  • 0 in reply to Christopher Hall
    Prodigy 230 points

    Hi Chris,

    Here is the ADC output signal when I send a continuous sinusoidal signal of 2Vpp (-1V to +1V) using the function generator with the board in the bipolar mode:

    Here is the ADC output signal when I turned off the function generator without unplugging the terminals:

    Here is the ADC output signal when I unplugged the terminals, making the ADC channels float:

    A picture showing the connections between the function generator and the board:

    A picture showing the connections between the board and the power supplies (the second power supply is used for the -5V and the GND of both of them are connected):

    All the jumper connections in the board are default from the factory, except J12 that was unplugged in order to supply via J14. The switches are also in their default position from the factory.

    I am really lost here, I hope you can help me set this board in the bipolar mode.

    Thank you in advance,

    Hiago

     

      

  • 0 in reply to Hiago Santos da Gama
    Prodigy 230 points

    Another question, after testing the board on the unipolar mode with a constant negative signal, the results matched with the sent signal. Does that mean that even in the unipolar mode the ADC can work with both positive and negative voltage? Is the voltage reference always +2,5V and -2.5V? What's the difference between unipolar and bipolar mode?

    The following picture shows the output of the ADC in unipolar mode with a -1.4V signal.

    I'm a kinda lost here, i hope you can help me.

    Thank you again,

    Hiago.

  • 0 in reply to Hiago Santos da Gama
    Prodigy 230 points
    Hi,

    I discovered that the problem I had with the readings was the signal generator's plugin. After changing it I was able to read the data from the ads1282.

    I still don't understand the difference between unipolar and bipolar mode in the evaluation board. The ads1282 reads +2,5v and -2,5v both in the unipolar and bipolar mode. I thought it could only read negative voltage on the bipolar mode. Can you help me understand the difference between these two modes?

    Thank you in advance,

    Hiago
  • 0 in reply to Hiago Santos da Gama
    TI__Mastermind 44670 points
    Hi Hiago,

    Glad to hear you resolved this issue!

    I posted a response to your new question in the other thread: e2e.ti.com/.../2785985

    Let me know if I can help with anything else!