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ADS1298R: Pace Maker detection

Roberto Zanaboni1
Prodigy 220 points

Part Number: ADS1298R
Other Parts Discussed in Thread: ADS1298

Dear forum

Reading your application notes TIDUB75-November 2015  ,about Sw Pacemaker Detection,  Is not clear for me why to use a exrra ADS704S ADC for monitor the pace maker pulse.

If the pacemaker max spectra is around 10KHZ, why dotn use the AD channle of the ADS1298 that is able to arrive to 32KHZ, more than the nyquist

freq.

Thanks for your help

Roberto

  • 0
    TI__Guru 68276 points

    Hello Roberto,

    Thank you for your post.

    While the maximum data rate in the ADS1298 (32 kSPS) satisfies the Nyquist criteria for a 10-kHz pace signal, the -3 dB bandwidth of the sinc3 digital decimation filter is only about 8.4 kHz. Some ECG applications require 10s of kHz of bandwidth to extract more detail about the pacemaker pulse characteristics, namely the pulse width and pulse amplitude. Applications which require this level of detail often use a dedicated wide-bandwidth channel to convert the pace signal separately.

    Keep in mind that all 8 channels in the ADS1298 must sample at the same data rate. Operating all 8 channels at the maximum data rate will increase the overall power consumption of the device and allow uneccessary noise into the ECG channels, which do not require such a wide bandwidth. For simple pace detection applications which only need to identify a pacer pulse presence, the bandwidth in the ADS1298 may be sufficient.

    Best regards,

  • 0 in reply to Ryan Andrews
    Prodigy 220 points

    Thanks very much for your reply

    Roberto