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ADS1298 ,CH1 Respiration out not proper.

Arun Soman
Intellectual 400 points

Hi Sir,

Trying to implement ECG Application based on ADS1294R .

 Input signal is fed from PS420 (Fluke Simulator).  

getting  ECG output from CH2, CH3 and CH4 with some 50Hz noise on baseline .

In CH1 (Respiration out), getting output with lot of noise and not able to make out clear envelope of Respiration signal.  The input components to ADS1294R, used  are with values same as given in the data sheet. Please do find some more input from customer :

  1. output data from other ch2 to ch4 gives ECG shaped waveforms when plotted.
  2. Respiration out is there with noise as well as doesn’t represent the input.
  3. when they have studied the captured data, for particular gain, the MSB byte is maintaining the same value for all samples. The MSB byte changes to another same value for different gain. The MSB byte value doesn’t seem to be proportional with gain. Also as the MSB byte is constant value, does it add any significance in decoding?
    Is the respiration data format is different from other channels?
    Please arrange to get the decoding format for the Respiration data out and for other channels.
  4. Data captured with 3 different gains are attached for reference. Input signal is – ECG-60BPM, Respiration – 30RPM, Baseline – 1000 Ohms, Delta R – 3 Ohms. The input is fed from Fluke Simulator PS420. Register setting : Modulating frequency – 64KHz, Phase – 135o .

Please help , anybody

Thanks in advance .