• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 397 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1115: Using both single ended and differential inputs

iConduct
Expert 5815 points

Hello Team,

The datasheet states that either 4 single-ended or 2 differential signals can be measured.     Can users use one differential pair along with one single ended input?   

Thanks,

Sem

  • 0
    TI__Guru* 92655 points
    sAm,


    The device inputs are controlled by the multiplexer. Take a look at page 19 of the datasheet and it'll tell you what inputs are selected by the multiplexer configuration bits. You'll be able to select one differential channel and one single-ended channel (or even two single-ended channels).

    Regardless of what inputs are selected the data will be represented as a differential input (with negative values represented in two's complement notation). With single-ended inputs, you will lose a full bit of resolution because the positive input cannot drop below the negative input set to GND.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Expert 5815 points
    Joseph,

    Thanks for your prompt response. I pointed out page 19 of the datasheet, but I failed to mention resolution loss for SE configurations.