I have question about adc differential input. Are they not suppose to be positive and negative? Than you get the benifits of differentials signals. In the circuit illustrated the differential input output voltage amplifier. Both of outputs are positive, so advantage what advantage does this circuit have than?
With analog signals differential is the difference between two points. For example with OUT+ = 2.5V and OUT- = 2.0V, differential voltage = 0.5V. With differential digital signals it is common to refer to the two signals as positive and negative which refers to their logic polarity, not voltage. The voltage for both signals are positive in most cases.