• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 380 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.

ADS1248: Switching between the analog references (REF0 and REF1) during sampling

Danilo A.
Mastermind 28720 points
Part Number: ADS1248
Other Parts Discussed in Thread: ADS124S08

Hi Team,

A customer wants to know if it is possible to switch between the analog references (REF0 and REF1) during sampling.

Regards,

Danilo

  • 0
    TI__Mastermind 28720 points

    Hi Team,

    Additional inquiry related to this device, is it possible to configure some ADC pins as differential and some as single ended? And also if it possible to make a differential measurement using AIN1 and AIN7 or other ADC inputs. 

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Guru 55312 points

    Hi Danilo, 

    Sorry for the delay in response. The reference can be switched at any time, but if it is switched during a conversion, the conversion will re-start similar to a MUX change from PGA, channel selection, etc. One thing to keep in mind when making this switch is the analog settling. 

    This ADC cannot be configured in this way, all measurements are made differentially. Due to the PGA common-mode limitations as outlined in the datasheet, the inputs cannot be connected to GND, making a true single-ended measurement not possible. However, a psuedo-differential measurement can be performed where one input is held at mid-supply and the other is measured with respect to that input. 

    The ADS124S08 is the new and improved version of the ADS1248. It is capable of making single-ended measurements by using the AINCOM pin. It also has a configurable delay to help remove errors due to analog settling from switching input channel settings.