Wondering if they are similar to differential amplifier (i.e loss of common mode rejection) or there are other mechanisms that prevent them from functioning as individual inputs.
They are differential inputs so the two signals are subtracted from each other and then exit the ADC as one signal, the difference of the two pins. So there is no way to extract two different signals.
Understood that there will be loss of 6 dB of dynamic range. It was tried on eval board and appears to work as expected.
Ahh, understood. I appreciate the fast response.
You are correct that each pin is its own input and you can feed it a single ended signal and lose 6dB of headroom. But if you put two different signals into the two pins you will get the difference between them not the sum. It is an interesting thought that if you invert one of them then do you get the sum? You have me thinking about this now... I will have to ask one of the designers exactly what the internal topology is. You can never get the two signals separately but sometimes a simple sum of the two is all you need. Like a stereo signal going to mono.
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