I'm trying to understand what is the advantage of using a difference amplifier as opposed to an instrumentation amplifier. Difference amplifiers have the problem of loading the signal, and mismatched loading will create common-mode voltage. This won't happen with an instrumentation amp. The only things I can think of is a diff amp can be faster and has differential output, and also maybe less expensive? I wouldn't think there's that much difference though. Why don't INA's have differential outputs?
Thanks in advance!
You forgot that ADC has differential input. And differential signal transmission has certain advantages, such as greater noise immunity. This is the scope of differential amplifiers.
yes I'm aware of that, but why not just use instrumentation amplifiers, that was my question- I'll go through the designer's guide as mentioned by harrynsc