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Please any advice for connecting shield for my project ?

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rdpdo:
Hello everyone,

I have a project consisting of making an ADC main board with a raspeberry PI4B which will allow me to measure differential voltages from a MEMS sensor on remote micro-boards.

These boards are connected to my main ADC board with 4-wire AWG32 cables + shield. The wires transport differentials analog outputs from MEMS IC.

I wonder how to connect the shield on the side of the ADC card and on the side of my MEMS micro-cards.

Could you give me your opinion please?

Thank you !​

Roehrenonkel:
Salut rdpdo,
 
just on one side, if on the ADC-side or the sensor-side you have to work out by yourself.
With (differential) audio-applications i connect the shield just at the input (not the source)
but with active sensors it might differ.
 
Good luck

Terry Bites:
The shield should tie to agnd. Don't connect to the shield to ground at the remote sensor end. You don't want any power supply currents flowing in the shield.

rdpdo:
Thanks you very much for your help !

rdpdo:
Last question... does the order in the connector is correct ? Vcc-Vh-Vl-GND where Vh and Vl are the differential voltage ? Does it matter ? Thanks !

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