• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 96 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.

ADS9110: Digital code output vs. Vin

user4811888
Intellectual 530 points
Part Number: ADS9110

Hi expert,

I'm learning Precision Lab series video and have seen ADS9110 has been take as example. I have one question for relationship of digital code output  vs. analog input: when will code 0000 become into 0001?

If we define "VLSB" as voltage width for 1 LSB code:

In the first image, the 0 turns to 1 @0.5VLSB;

In the second image, the 0 turns to 1 @1VLSB.

Which is correct in real ADC converter? Is it related to SAR or Sigma-delta?

  • 0
    TI__Mastermind 36150 points

    Hello,

    Ideally, the code transition occurs at 1/2LSB, as shown in the first image.  For a real device, this transition point can vary depending on the code value and is measured by DNL.  Both images are used to describe an ideal low resolution ADC, and at higher resolutions, the other errors, including noise, linearity, offset, and gain are much greater than the ideal transition point.

    Regards,
    Keith Nicholas
    Precision ADC Applications