I'm trying to find an ADC for measuring the voltage across a 1mOhm Shunt, and a voltage divider (looking to measure current and voltage for power calculations)
I need 2 inputs, with the samples from these 2 inputs to be sampled within 100usec from each other
I would like to see full scale 150mV (150A) across the shunt, and be able to resolve 5mA or better.
1000 samples/sec
I started to look at 24bit Sigma-Deltas, with multiple inputs, but I'm not sure if they can sample between inputs fast enough (< 100usec)
I think 18bit SAR may be the way to go.
I was wondering if anyone had any advice on how to go about finding the right ADC for this type of design, as far as what to look out for/avoid, or maybe what to pay attention to for the front end design, I think with some of the 24bit Sigma Deltas, you could put the shunt right across the input, and not need a front end amplifier stage.... but I'm not sure.
much thanks!