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Getting saturation results from ADS1292R

Sairam Kishore badireddi
Prodigy 100 points
Other Parts Discussed in Thread: ADS1292R, ADS1292

Hello TI,

We have incorporated the design shown in Fig:56 of ADS1292R in our wearable product. In our case the electrodes are placed on the PCB.

While plotting the results on the android app we are getting either positive or negative saturation values most of the times. Barely after a long time it is settling down and showing barely ECG plot with noise(high frequency and line noise).

We are expecting this might be due to the ESD static build-over.

Will any series resistors on  both the Channel 1 and 2 help us in reducing ESD or only ESD suppression diodes should be used.

Will the ESD suppression diodes creates any other hindrances in capturing correct ECG signals. 

Moreover, Why TI is not recommending any ESD diodes for AFE and how are they getting rid of these effects.

For the high frequency filtering, whether the Capacitors shown as DNI in the evaluation board should be used.

Regards,

Kishore.

  • 0
    TI__Guru**** 180741 points
    Hi Kishore,

    Feel free to post a plot of your ADS1292R data here so that we can get a better understanding of what you are seeing. What type of electrodes are you using? You might be experiencing 'motion artifacts' rather than an ESD event. Low leakage Schottky diodes (like Vishay's BAT54) would be one means to protect the ADS1292 from electrostatic discharge events if that is your issue.