Using the ADS1292R,I find the signal wave of ECG will change to bad if using the channel of respiration.
please help me find the source of problem.this is my schematic design.
In addition,if I dont use the low-pass filter circuit,should there be a resistor to match the input impedance?I find the resistors(100K) can decrease the amplitude of 50Hz wave.
thank you .
Alex SmithApplications Engineer | Precision Delta-Sigma Converters
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In reply to Alexander Smith:
Thank you for your reply.
My schematic diagram is designed according to the TI's example(tidrk32)
C36 and C38 of my design corresponds to C56 and C63 of TI's example. it is used for high-pass filter.I may try to replace 0R resistor.
In reply to Ryan Andrews:
Yes,What you said is what I want to express.
I didnt save the result wave diagram.I cant distinguish the ECG wave if I weld the respiration module circuit ,It is random wave.this is my register settings
In reply to user4365468:
I weld a new PCB,this is my sample diagram.
1、No respiration channel(no C36&C38):
this is my digital-filter arithmatic
(effect is not good)
By comparison,It is better than the old pcb.I should make more digital filter and it will be good. I didn't recognize the ECG wave of the sampling wave diagram of old PCB in the past .
this is raw datas:
It is strange that the 24bit sample value is 7FFFFF of respiration channel??
It should be good,I will try other digital-filter.
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