• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 729 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.

DNL/INL vs Resolution

Hithesh
Genius 3290 points

In a 12-bit ADC, if only 8-bits are used our of 12-bits, how would DNL/INL affect the ADC output.  

If INL is +/-2bits, would it still be the same when only 8-bits are used out of 12?

  • 0
    TI__Guru* 92715 points

    Hithesh,


    I'm not exactly sure how to answer this. Integral and Differential Non-Linearity (INL and DNL) describe the error of the ADC output data given a particular input. There is an application report called Understanding Data Converters. The link is given below:

    http://www.ti.com/lit/an/slaa013/slaa013.pdf

    INL and DNL are described on pages 10 and 11. If you look at figures 5 and 6, you could make the argument that if you start taking away bits (say reading one less bit than you could), the error from the input value side would get larger.
    As an example, if you have a 12-bit ADC with 1 bit of INL and DNL error, and you only read back 8 bits, your INL and DNL would still be 1 bit, but the LSB is much larger in this case because your resolution has gotten worse.

    I hope this answers your question. If you need clarification, or have other questions, feel free to post back.


    Joseph Wu