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The input channels are getting saturated at input channels of ADS1298. We are using voltages AVDD +2.5V and AVSS -2.5V. DVDD = 3.3V, Reference voltage = internal 2.4V.
Earlier I was using a Resistors and capacitors to set the baseline voltage to 1.2V(R20 = 2.2MOhm, R19 = 1MOhm and C7= 4.7uF as in image below) and it was working fine all the time for all the leads.
But when I removed R and C level shifter to get the DC lead off implemented. The input differential band goes beyond the reference voltage so getting the values 0xFFFF in few channels.
Please help me to get the stable (constant) baseline with no R and C level shifter circuit. Attached image below of ADS1298 schematic. Is the RLD circuit is correct ? please check values for R41 and C66 as well
When all 10 leads are connected to the subject to acquire 12 lead ECG the voltage band for each channel should be within the reference voltage all the time. Please help me to achieve this.
Thanks in advance.
