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ADS42JB69: Inputting an analog voltage greater than representable digital output and MTBF

Danilo A.
Mastermind 27440 points
Part Number: ADS42JB69

Hi Team,

We have received this inquiry from our customer.

The part is integrated into a radar design. The radar periodically sends power into the ADS component greater than the 2Vpp value (all bits are 1, overvoltage condition is met), but < max input power. Does this practice reduce the MTBF of this part? is there any data on potential damage to this component when inputting signals close but not exceeding max input voltages. 

Regards,

Danilo

  • 0
    TI__Mastermind 30580 points

    Hi Danilo,

    There is no data on this type of performance metric when over driving the analog inputs. This is very common question for converters and unfortunately there isn't much guidance other than, the input voltage cannot exceed the absolute max ratings outlined in the datasheet....even if just for a short instant in time. This will start to degrade the device.

    It is up the customer to protect the analog inputs if there is a chance the signal will go above the absolute max ratings. This is typically done by adding in a limiting circuit or back to back diode to clamp the input signal voltage when the signal goes above fullscale of the converter.

    Regards,

    Rob