Hi,
I'm currently working on prototype of ECG device basing on ADS1298 chip, and I have some questions regarding possible solutions.
First of all I would like to ask about power supply. i'm going to use 3.3V digital supply and 2.5V analog supply (unipolar). Could you tell me if there are any significant disadvantages of using unipolar power supply instead of bipolar for this chip?
I was considering AC coupling of input signal with 1uF capacitor in series between electrode and ADC input and 1Meg resistor in parallel, connected to RLD. Have you succesfully tested such solution? Any advice on this?
If I will use AC coupling, will this be still possible to use built in LEAD-OFF detection?
I don't want to use any amplifier in front of ADS1298, thus I guess it's good idea to have the reference voltage as small as possible (to provide biggest possible resolution of ECG signal). Can you tell me how low can I go with reference voltage. I guess there won't be any straight answer for that, since it will depend on many factors, like noise from the rest of the circuit, etc. but maybe you can tell me what is the lowest reference voltage which you have succesfully tested?
Thanks in advance for any help.
