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DDC232: Output Drift

Jejomar Ildefonso
Genius 9680 points

Part Number: DDC232

Hi Team,

Our customer is experiencing severe thermal drifts on their output signal using the DDC232 ADC. From their opinion, this is most likely due to offset voltage drifts of the amplifier. However, we're not quite sure how to estimate the resulting effect on the output. Can you guide us on how can we calculate the output voltage after the first amplifier stage, taking into account the offset voltage drift?

Thanks in advance!


Kind Regards,

Jejomar

  • 0
    TI__Expert 4680 points

    Hi,

    Not sure I follow when you say output voltage drift? There is an offset temperature drift spec on the DS. Basically how the output code changes with temperature for no input current (input disconnected or connected to ground with a large resistor). Typ 0.5ppm of FSR/C. Max of 5. This includes all the effects in the signal chain adding up to it. There is also a time drift/stability. Are these enough?

    Regards,
    Eduardo