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ADS125H02: mechanical stress from PCB makes component misbehave

user6078182
Prodigy 10 points
Part Number: ADS125H02

Hello,

I am building a PCB board which is submitted to strong mechanical stress due to specific application.

The circuit seems to work fine without the mechanical stress, but after the PCB is submitted to mechanical stress it misbehaves. By testing individual components, it seems that the ADC ADS125H02 behaves differently based on the same electrical inputs depending on the mechanical stress. Do you have any way to confirm this or a solution to monitor mechanical stress during operation of the circuit?

Thanks and regards,

Gaspard

  • 0
    TI__Mastermind 44610 points

    Hi Gaspard,

    Welcome to the TI E2E forums!

    What kind of "misbehaving" effects are you observing when applying stress?

    I do know that the internal bandgap reference can be especially sensitive to stress, causing the internal reference voltage source to shift. However, any integrated sub-circuit that relies on matching transistors or resistors (for example), will behave differently when subjected to non-uniform stress. Where possible, I would avoid placing sensitive analog components on areas of the PCB that are susceptible to high stress, or possibly moving these components to a separate but connected PCB that is not subjected to the same levels of mechanical stress.