External I/O (Smartstream, etc.).

[cyrille de brébisson]

Hello,

I was involved, in the past in the creation of a streamer, and we found it particularly challenging...

The basic issue is the precision that you need to have on the analog part in order to differentiate between the probes.

Most probes work in 5V. They are identified by resistors. They are around 75 different probes.
Since the sensing circuitry is all 3.3 or lower voltages (but input are in the 5V range), you need to divide the inputs before digitizing them.
So, the analog and digitizing needs to be accurate to within 1/75=1.3%. This is VERY hard to achieve...

Cyrille