Being a hopeless amateur at analogue electronics, I hope someone can give me a few hints on a problem that I have :)
I have a differential analogue sensor with the outputs swinging between 0.5V to 4.5V centered at 2.5V. That is, (4.5V - 0.5V = +4.0V) at one extreme and (0.5V - 4.5 = -4.0V) at the other extreme. The sensors are to be fed into a sigma-delta ADC. Signals are low frequency: about 400Hz BW.
Unfortunately, the sensors require buffering: the output impedance is not well specified in the datasheet and the ADC likes a low-impedance source. I can put the ADC in single-ended mode, but it would be nice to keep using the differential input.
I can do a simple voltage follower op-amp on each of the differential inputs, but it feels like there must be a better solution for a simple task like this. Plus there's the issue of matching op-amps etc. I suppose I could use an instrument amp, but ...
Can anyone recommend a good solution and/or part? Surely there must be something out there for a simple buffering problem like this :)