• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 589 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.

Ads1298 pace detection problem

Miguel Perez Cabrera
Prodigy 140 points

Other Parts Discussed in Thread: ADS1298, ADS1298ECGFE-PDK

I have a development kit  ADS1298ECG-FE ECG Front-End Performance Demonstration Kit. At page 64 of Ads1298's datasheet says: "that the total gain in the pace path is

(0.4*PGA_GAIN).  At PACEOUT_1   I don't see the signal multiplicated by (0.4*PGA_GAIN). The  Vpeak_to_peapk of the input signal  is equal to the   output signa.  I've tried with all gain and it doesn't modify de Vpp.

What am i doind wrong ???    

2- Why if i select two channels for pace_detection the rest of the channels modify the amplitude when switch them between normal electrode and gnd

  • 0
    TI__Guru**** 182721 points

    Hi Miguel,

    Welcome to the E2E forums!  To help us answer your first question, what is your signal source to the ADS1298ECGFE-PDK?  For your second question, signal source is also involved here, but when you refer to a modification of the amplitude, are you referring to the PACE out pins of the graphical display of the ADS1298ECGFE-PDK software?

  • 0 in reply to Tom Hendrick
    Prodigy 140 points

    Hi Tom,

    The signal source to the ADS1298ECGFE-PDK is a digital signal generator. We're inputting a signal that  has amplitud of 10mV, offset=0, f=20hz, sin. We have tested with a variety of signal and amplitudes and we have obtained different results, so we don't have a conclusion about it. Our VREFP=2.4V internal and it's working well and

    VREFN=AGND. If you have any questions that can help you to understand what we're doing wrong please ask whatever you want. 

    We're a worried about it because we have developed a custom board pcb and it is the only thing that it isn't working.

    Best regards