I'm designing a front-end for an ADC that will be measuring the voltage of a hall effect current transducer.
I have been reading up on differential vs single-ended measurement, and have become a bit confused as to how differential measurements work in a case like this.
I need to filter out noise that will be imposed onto the signal from the transducer because the wiring is passing through an electrical distribution box that has AC.
What I don't understand is this: if I want to reject this noise by using a differential amplifier, do I need to have an isolated power supply powering the current transducer? If not, then where do I make the ground connection in the differential measurement schematic, below?
Also, do I run all the wiring to the current transducer as a double twisted pair (i.e. all 4 wires?)
The hall effect transducer that I'm thinking of using is CSLT6B100, which has a ratiometric voltage output of 2.5V ±1500mV over the range -100 to 100 A
It's block diagram is as follows:
and transfer function: