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EMG data Acquisition with ADS1298

Tapas Choudhury
Prodigy 20 points
Other Parts Discussed in Thread: ADS1298, ADS1298ECGFE-PDK

I want to use ADS1298 For my  EMG data Acquisition. what kind of input stage circuitry need for it (filtering and protection)?

  • 0
    TI__Guru**** 181021 points
    Hi Tapas,

    Welcome to our forum! For starters, you can review the schematics associated with the ADS1298ECGFE-PDK.
  • 0 in reply to Tom Hendrick
    Prodigy 20 points
    Thanx for your reply, i have already read all things, i just want to know , in the input stage of channels which kind of circuitry we need , it just a passive band pass filter for desire range ?
  • 0 in reply to Tapas Choudhury
    TI__Mastermind 38745 points
    Hey Tapas,

    You will probably need some sort of RC anti-aliasing filter. The modulator samples data at 512 kHz in HR mode and 256 kHz in LP mode so the anti-aliasing filter will just need to make sure attenuation is enough around that respective frequency. No need to make it too sharp of a roll-off since delta-sigma ADCs do a lot of filtering on their own with a digital filter. In addition, the PGA has some anti-aliasing functionality, so that will help keep the external anti-aliasing requirement pretty relaxed.

    You may not need a high-pass filter depending on how you are doing things. This ADC has pretty high resolution which means you can have relatively large offsets and still obtain the small ECG signal that's resting on top of that offset. Are you planning on using the RLD amplifier to bias the patient? If so then I'd say there is no need for a high-pass filter. If not, then you'll need to ac couple the inputs to keep the input common mode within range.

    Regards,
    Brian Pisani