I went through a discussion initiated by Yee http://ez.analog.com/thread/6389?tstart=0 in which you have discussed choosing an appropriate isolation scheme for an ECG system. I too have a similar problem, but since my case is slightly different, I decided to post my query in a new thread.
Well the topic almost states it all. But I've designed the conditioning system for a battery operated EMG proccessing system which is later driving a graphic LCD after processing the EMG signals.
The processor I am using has an inbuilt 12 bit ADC which I am planning to use for the signal acquisition purposes. Therefore, will it be safe to isolate all my driver circuits from my signal processing system, or must I have an ADC off the processor with a digital isolator in between?
Therefore basically my question is whether it is safe to have this sort of an assembly:
Electrodes-->Conditioning Circuit--> Processor with inbuilt ADC--> Digital Isolation--> Driver Circuits--> Driven Device.
(I am using a bipolar supply for my signal acquisition system and analog conditioning circuit (+/- 5volts) and am upshifting the signal using a summing amplifier and a dc bias at the last stage so the the signal becomes wholely positive.)
Thanks a lot,
P.S: Or would the best solution for me be an analog isolation system before my processor circuit?