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ADS1115 may be destroyed?

Loek Keizer
Prodigy 10 points
Other Parts Discussed in Thread: ADS1115

Hi,

I'm implementing several ADS1115 ADC convertors, pre-mounted on breakout boards. The vendor of these boards warns that the ADS1115 can be destroyed if a too high gain is selected by the driver software. So, even if the input signal is well within the allowed electrical limits (0..5V), one could easily destroy the chip by selecting a gain that would put the result outside FS (full scale).

I didn't find any such warning in the TI documentation, but I cannot ignore vendor's warning either. 

Can anyone comment?

  • 0
    TI__Guru* 92715 points

    Loek,


    Damage to the device may occur if the inputs go beyond VDD+0.3V or GND-0.3V (this is listed in the absolute maximum ratings on page 2 of the datasheet.

    However, if the inputs only over range the analog input (as in going beyond the full scale). There should be no risk of damage. The PGA is not implemented as an amplifier, but through a switched capacitor sampled scale, so there is no saturation to overcome. Also, the modulator is reset after each data sample sample is completed.  The ADS1115 will give a full scale reading when over ranged and will give a correct reading in the first complete data period where the inputs are not over ranged.

    Joseph Wu