• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 279 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

ads1178: Cal factor question

Niranjan Madhavan
Intellectual 605 points
Other Parts Discussed in Thread: ADS1178

Hi 

I am using ADS1178 for my circuit with Vref=2.5V.  Theoretical mV/count value is supposed to be 0.0761mV/count(5/(2^16)) but, measured value is only 0.0821mV/count. Is this deviation normal? If not, what could be the reason? Where to start debugging? 

I checked for any fluctuations or change in Vref, but it is on 2.5V as intended

VrefP is at 2.5V and VrefN is 0V
AVDD 5.0
IOVdd 3.3V1
DVDD 1.8V

 

 

  • 0
    TI__Guru 66516 points

    Hi Niranjan,

    Thanks again for your interest in the ADS1178! I will address this question separately from your other post.

    You could see some deviation in the mV/count (also referred to as least-significant bit (LSB) size) depending on the accuracy of your reference. Where does the 2.5V come from and what is used to drive the VREFP pin?

    Best Regards,