In my current project, I need to transmit 4 analog signals (A1, A2, A3 and A4) on a cable from one PCB to another. I am working at 3 VDC and the distance between them is relatively short (< 30 cm).
I am not comfortable with this situation since I have always worked within my PCB. I have read that the transmission needs to be differential, so I will transmit 9 wires : A1-, A1+, A2-, A2+, A3-, A3+, A4-, A4+ and GROUND.
What should be my configuration to make it work ? Or more precisely : what type of component should I use to transmit and receive the data on both ends ? Are there standard references ? Will the differential signals be digital or analog during the transmission ?
I may ask basic questions but I am a beginner at this, sorry...
Any help/advice will be greatly appreciated. :)
- My PCB will need to pass the EMC certification, which is why I need to be careful with signals I am transmitting.
- The analog signals are related to this ECG sensor : https://datasheets.maximintegrated.com/en/ds/MAX30001.pdf . It needs to inject and receive current on two pins and measure the voltage on two other pins.
- The frequency of the current injected can reach 131 kHz based on the datasheet
- I need to be as accurate as possible, which is why I need to transmit the analog signal as differentials