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ADS1115 single-ended resolution

Jesus Martinez81
Prodigy 50 points
Other Parts Discussed in Thread: ADS1115

Hello,

I want to use the ADS1115 with an analog input range of 1.5V (single-ended). The converter will be supply with VDD 3.3V. My first question is if the ADS1115 is suitable for this input range and, then, which is the resolution that I will have.

From the datasheet I understand that in single-ended mode the resolution is 15 bits. If I set the internal PGA to 2 (default value) my effective input range will be +2.048V and I will obtain a resolution of 2.048/((2^15)-1) = 2.048 / 32767 = 0,0000625V (62.5 uV)

Is the ADS1115 suitable for my input range and are my figures correct?

Thank You!

 

  • 0
    TI__Intellectual 1610 points

    Hello Jesus,


    Thank you for posting in TI E2E forum.

    The resolution of the ADC will always be 16 bits. However, in your case, since you are doing single-ended measurements, you are utilizing only one-half of the entire full-scale range. This is equivalent to reduction in the effective number of bits by 1.

    Since your input range is 1.5 V, you are in the correct full-scale range setting (±2.048 V). Irrespective of whether you do single-ended or differential measurements, your resolution (or LSB size) for ±2.048 V full-scale range will be (2*2.048)/(2^16-1) = 62.5 uV.

    Yes, you are utilizing the most optimum full-scale range setting.

    Let me know if you have any questions.

    Regards,

    Krunal