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ADS7052: input ESD diodes

John Larkin
Prodigy 120 points
Part Number: ADS7052

Tool/software:

If we limit the current to the specified 10 mA and don't care about what happens to the data, can we occasionally

drive a bit of current into the positive analog input, specifically into the upper ESD diode,

without a latchup or other hazard?

Yes, this technically violates the abs max input voltage, but what will actually happen?

  • 0
    TI__Genius 11885 points

    Hi John,

    The concern when exceeding the 10mA absolute maximum current rating is damaging or completely burning out this ESD protection circuitry. I have seen cases where the absolute maximum ratings are not observed, and analog input pins are made unusable by being permanently shorted to ground.. Sometimes, this damage can be visibly seen by delamination of the bond pads from the die, and charred areas surrounding the damaged pin. 

    With that said, going over the absolute maximum voltage rating is usually not a concern as long as the current is limited to under 10mA. For long-term reliability of the device, it should be kept well under that, at 1mA or below.

    Regards,
    Joel

  • 0 in reply to Joel Meraz
    Prodigy 120 points

    That's great. We're driving from an opamp that's powered from +5, and we can have a 1K series resistor-capacitor lowpass filter, so we would be close to 1 mA max.  We don't need extreme accuracy either.

    Thanks