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ADS1015: Data inaccuracy threshold

Matthew Martin
Prodigy 10 points
Part Number: ADS1015

Hello Experts,

I have been doing some testing with the ADS1015 and was wondering at what voltage past VDD I should start to see data inaccuracy of an analog input. The data sheet states under the recommended operating conditions that the voltage of an analog input should not exceed VDD. The data sheet also states that the max rating is VDD +0.3V. Keeping this in mind, I have been testing up to VDD +0.3V and have not experienced data inaccuracy. I have mainly been testing the analog inputs from 2.8-(3.2 or 3.6)V with a full scale range of 4.096V. Any information would be greatly appreciated. 

Thanks, 

Matt M

  • +1
    TI__Mastermind 22950 points

    Hi Matt,

    I don't expect to see any data inaccuracies below the ABS max rating. The reason for the VDD + 0.3V spec is due to the internal diode structure. Please note that if you supply an analog input with a level greater than this spec, damage to the device may occur. It is best practice to ensure that the input signal level is at an appropriate level.

    The only thing that may cause some inaccuracies is the full-scale range (FSR) setting. If this range is chosen incorrectly, then you will see the ADC saturate sooner or later (depending on your input signal level and FSR) than expected. 

    Regards,
    Aaron  Estrada