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TMUX1308: Analog mux(5V 8:1~4:1) for C2000(ex 28379 28388)

CHOI SEUNG WON
Expert 1245 points
Part Number: TMUX1308

Dear TI

I would like to inquire about analog mux switch products.

Power uses 5v.

The input signal is in the 0~5V range, and the output signal is also in the 0~5V range.

The signal connection can be 8:1 or 4:1.

And after reviewing the analog mux product, do I need to review OPMAP's RIRO or frequency band? And should the input resistance specifications of the analog mux be reflected in the design?

Best regards, Choi

  • +1
    Guru 317110 points

    A switch, when closed, behaves pretty much like a resistor; see the RON specification. Your circuit will work if it would also work with a resistor in this place.

  • +1
    TI__Genius 10552 points

    Hi Choi,

    When evaluating a mux in a system, the goal of a mux is to have minimal impact on overall performance. In this case, you can think of the mux as a simple resistor in your signal chain. The resistance can be found using the Ron (On-Resistance) spec found in the datasheet for the specific voltage supply used. For example, at 25C this device has an Ron of 75 Ohms at a 5V supply. The resistance will increase over temperature and at lower supplies. Also note that the device has a max bandwidth of 500MHz at 5V supply as well. 

    Regards,

    Alex