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Input and output impedence of TS5A23159 (demultiplexer)

Rishi Soni
Prodigy 10 points
Other Parts Discussed in Thread: TS5A23159

I am using the IC (TS5A23159 - http://www.ti.com/product/TS5A23159) for the demultipelxing application in my circuit. The exact values of the input and output impedance of the demux is not mentioned in the datasheet. It is common that the ICs today have high input impedance and low output impedance for complete transfer of the signals. But the circuit I am using is very sensitive and I need to have the details of input and output impedances of each and every component that we have used in the circuit. So I request the experts in this forum to help me out with the details of input and output impedance of the IC (TS5A23159)

  • 0
    TI__Genius 11845 points

    Hello Rishi,

    Thank you for your post.

    The input and output impedance of the TS5A23159 are not pertinent specs for this particular type of IC. The TS5A23159, along with the other analog switches, are non-buffered switches. Non-buffered analog switches are FET-based, which means they do not have a high drive strengh outputs, but instead simply pass the signal from the input to the output.

    Therefore, the spec that is most pertinent to determining the impedance of the IC is Ron. Ron is how much resistance is produced by the internal FET of the IC. For the TS5A23159, the Ron at 5 V supply is ~0.7 ohms. This resistance (impedance) is extremely small, thus the signal degredation would be extremely minimal. Essentially whatever signal you are inputting into the device is the same signal you will receive on the output.

    Regards,

    Jared