• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 284 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.

ADS1292R: Usage of Bipolar supply

Maharajan Maruthupandi
Prodigy 80 points
Part Number: ADS1292R
Other Parts Discussed in Thread: ADS1292

Hello,

I am going to use bipolar supply for ADS1292R in my design. I need the below clarifications regarding that.

  • AVDD is +2.5V and AVSS,VREFN is  -2.5V. I need to know that, what would be VREFP voltage w.r.t VREFN if VREF_4V bit in the CONFIG2 register is set to 1?
  • What would be the amplitude of RESP_MODP/N siganls w.r.t AVSS?
  • Will you provide the layout design guideline?

Regards

Maharajan

  • 0
    TI__Guru 66256 points

    Hello Maharajan,

    Thank you for your post.

    The reference voltage is always differential (VREFP - VREFN). Therefore, when VREF = 4 V, VREFP will be equal to -2.5 V + 4 V = +1.5 V. The amplitude of the RESP_MODP/N signals will have a peak-to-peak amplitude of VREF. RESP_MODP and RESP_MODN will be 180 degrees out of phase such that the difference between them is equal to +VREF or -VREF (RESP_MODP - RESP_MODN).

    Please refer to the Quickstart Guide in the ADS1292 datasheet as well as the ADS1292ECGFE evaluation board for layout guidelines and examples.

    Best Regards,