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ADS1296R: ADS1296RIZXGT Testing Faulty Parts

Craig Smith97
Prodigy 20 points
Part Number: ADS1296R

Hi all,

The part in question is fitted into an sleep analyser we produce onsite; the part is reading an analogue signal through the BGA, we’re measuring a differential signal into IN4P and IN4N on the BGA but most of the time does not reach its optimum point/set range (set by the customer).

We unfortunately don’t have the means to test the removed BGA on site; therefore I’m asking if anyone knows a method to test removed parts or can you recommend a testing method please.

 We believe the removed parts are working fine but the range set by the customer is too narrow meaning not all parts are passing- by conducting a test on so called ‘faulty parts’ I want to ensure they are working within your set specifications. Proving the customer tolerances are wrong.

 Any help would be greatly received.

Kind regards,

Craig.

 

  • 0
    TI__Guru 60476 points

    Hi Craig,

    Thank you for your post and welcome to our forum!

    We can start by debugging this issue without removing the device for now. Please provide more details about the test setup. We will need to know more about the signal you are applying to the channel 4 input, the supply voltages used, what the output data looks like, the pass/fail conditions etc. A partial schematic and list of register settings will also be helpful to understand how the device is being used.

    Regards,

  • 0 in reply to Ryan Andrews
    Prodigy 20 points

    Hi Ryan, thanks for the info I have spoken with our Test Engineer; please see above schematic and info shown below. thanks again.

    Here’s an example of the voltages we’re getting. Unfortunately we’ve fixed all the ones with the BGA problem so it’s just a passed unit:

     

    Unit status

     

    Low Pressure (V)

     

    High Pressure (V)

     

     

    AVDD

    IN4P

    IN4N

    Difference

    IN4P

    IN4N

    Difference

    Known good

    2.7936

    1.3940

    1.3941

    -0.0001

    1.3948

    1.3932

    0.0016

     

    Inconveniently low resolution on the low pressure  - I’ll see if I can gather some better readings from other failing units as they turn up.

     

    You’ll have to see Embla for the register settings and how the outputs are converted into numerical values as we don’t get a copy of the source code.

  • 0 in reply to Craig Smith97
    TI__Guru**** 172266 points
    Hi Craig,

    Have you gotten any more data to share from other failing units?