I would like to use the LTC2485 for directly measuring a high side shunt voltage for measuring a highly dynamic current.
The shunt resistance will be 30 ohms and the voltage after the shunt will be regulated (to compensate for the shunt variable drop).
So the VIN+ and VIN- signals will not correspond to a fully differential signal, because VIN- will be kept at a relative constant voltage whereas VIN+ can go up to 1.6V from VIN-. Therefore the middle voltage will be changing, possibly at a high frequency.
So my questions are:
- Is this ADC recommended for this kind of measurement? If not, what can you recommend?
- Is there any drawback in accuracy compared to a properly centered fully differential signal?
- The input signal will contain high frequency content, so I plan to use a double 10kOhms 1nF RC antialiasing filter before the inputs, is this OK?