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we are using ADS 1298 8-Channel 24-bit ADC With Integrated ECG Front End. when we power up device approximate 30 sec output will come exactly then noise will add all channels as per my observation when power up VCAP3 voltage level approximately 3V is there after that constantly decreasing voltage level when level draping the 2.82V or less than that then noise is over riding original ECG signal.
Please replay as early as possible
thanks and regards
Chandrashekara
Hi Alex,
We replaced the ADC but still we are getting the noise problem.
VCAP3 voltage level approximately 3.7V is coming at power up condition after that constantly decreasing once it crosses the 2.82V, noise is over riding the original ECG signal. We have checked by replacing the battery with clean power supply.
VCAP1 = AVSS + 1.2V and VCAP2 = (AVDD+AVSS)/2 is correct.
Let us know the reasons for the noise and ideas to rectify it.
Best Regards
Chandrashekara