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TS5A6542 SPDT Logic Translation Analog Switch (grounding)

Steve P. (NY)
Prodigy 145 points

Dear TI Support,

I have a general app's question on application of the subject switch that deals with VIO, V+ returns relative to the COM, N.O., N.C. signal source returns.

I may have a ground isolation issue between the analog switch and signal source/load, and wanted to review this concern with a TI app's person relative to this device and how it operates internally.

Thanks in advance for the dialog.

Steve

NY 

  • 0
    TI__Prodigy 515 points

    Hi Steven,

     

    Our analog switches are passive and consume very little static and dynamic current as a result.

    The main current consumption path is due to the digital control input which handles gate drive/bias for the switch.

    Thus, the GND return for the analog switch can essentially be considered a digital GND.

    If your signal source for the switch path is analog in nature as opposed to digital, you may need to provide isolation from the digital GNDs in your system to reduce additive noise/crosstalk.

    This is typically done using a star connection for all analog GNDs in your system to a common GND plane via/connection.

    The digital GNDs will also connect to the common GND plane at a common point.

    This method helps keep digital return currents off of the analog GND reference and vice-versa.

    A helpful application note for noise reduction PCB design techniques is attached.

     

    -Jason

    PCB Design - EMI.pdf