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TMUX1574: Analog Signal

Will Alarcon
Prodigy 80 points
Part Number: TMUX1574
Other Parts Discussed in Thread: TS5A22362, TMUX6136

Datasheet says it  supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins and can pass signals above supply up to VDD x 2, with a maximum input/output voltage of 5.5 V.  Do I have to couple my analog signal to 2.5V?  will this IC allow negative voltages?  Is there another device similar to this one that will allow AC coupled analog signals?

Thanks,

  • 0
    TI__Expert 5660 points

    Hello,

    Thanks for posting to E2E. In the recommended operating conditions table of the TMUX1574 datasheet, you can see that the input/output voltage minimum, VS and VD, is 0V. Therefore, this switch is not capable of passing negative voltages (or an AC coupled signal). You may certainly bias the signal so that the whole peak to peak voltage range is within the recommended operating conditions of VS and VD.

    If you cannot bias your signal, I recommend using TS5A22362, a 2:1 switch that is capable of switching negative signals. What is your supply voltage? What is the peak to peak voltage of the signal you need to pass?

    Regards,

    Kate

  • 0 in reply to Kate Dickson
    Prodigy 80 points

    Thanks Kate!

    I plan on using a +5V supply with the maximum Vpp at 10V.  I believe TS5A222362 will work for my application.

    Thanks again,

    Will

  • 0 in reply to Will Alarcon
    TI__Expert 5660 points

    Hi Will,

    My apologies for the delayed response. 

    Actually, TS5A22362 will not support a 10Vpp signal. Take a look at the table below that demonstrates the device's capacity for negative signalling. TS5A22362 may pass signals as high as VCC and as low as VCC - 5.5V (including signals below ground). So, for a supply of 5V, the minimum voltage supported would be -0.5V.

     

    How about TMUX6136? This device can be used with dual supply of +/-5V and pass a rail-to-rail signal of 10Vpp.

    Regards,

    Kate 

  • 0 in reply to Kate Dickson
    Prodigy 80 points

    Thanks for the update!