HI Kris,
Thank you very much. I think our thoughts are quite in line, I am also inclined to use an ADC.
I have AD22151 Sensor which is a magnetic field sensor, I am using it to sense low amplitude AC and DC current(flux). I am using it in bit different way I am taking differential output between pin 5 and 7 so that even the sensor is single supply bipolar output essentially it is giving output across VCC/2 but due to my way of sensing it against the added offset I get differential output which is varing in +/20 mV for my current range. The main reason I am using pin 5 and 7 as out rather than pin 5 and GND is I need to DC couple my input and then amplify, if the VCC/2 offset is present then it won't be possible to provide high gain as it will saturate the INAMP.
Somehow I am not able to use the mentioned tool properly. It is not running in my browser IE 8.
Regards,
Chaitanya