Hello folks.. I've got a question about how to handle the X/Y differential signals.
From everything I (think I) understand, the X-/Y- signals are just the X+/Y+ signals inverted. And X+/Y+ signals are 0v to +5v and X-/Y- are 0v to -5v.
Say I'm building an ADC for ILDA signals (input), I know I can run the X+/Y+signals into two ADC channels, and then invert the X-/Y- signals and run them into tow more ADC channels -- but that uses up four ADC channels. But is that necessary?
Consider these two other options instead:
1. Invert the incoming X-/Y- signals with op-amps, and then average them with the X+/Y+ signals (in theory they should be the same, right?) -- and then feed that average X/Y signal into the ADC using two ADC channels
2. Only sample the X+ and Y+ lines (using two ADC channels) and just ignore the X-/Y- signals, and just mimic the X-/Y- signals in software by inverting the X+/Y+ data stream before writing out the digital data stream.
Any flaws in these approaches? Thanks.