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TS3USB3000 Con parameter and AC coupling questions

iConduct
Expert 5815 points
Other Parts Discussed in Thread: TS3USB3000

Hi Team,

Can you provide some insight on the following questions?

 1.       When looking at the switch specification, Con definition is not clear. In my analysis I used it as capacitive to ground. The analysis shows that 3dB point is about 1 GHz, which is lower compared to what is published in the specifications (6 GHz). However, in traditional analog switch this Con could be the capacitor as presented across the switch and in our case will only reduce the impedance at high frequency. I need clarifications on that.

2.       The CML signal can be interfaced with AC coupling. What would be the requirements/recommendations about biasing the switch?


Your support would be greatly appreciated.

Regards,

Sem Amesawu

  • 0
    TI__Mastermind 45575 points

    Sem,

    1.  Yes, the Con parameter is characterizing from the switch pin to ground.  The Con measurement varies with frequency and the 2.0pf stated in the datasheet is measured at 240MHz.  At higher frequencies the Con parameters can actually become inductive and first order RC models are a bit simplistic for a 3dB type calculation.  

    2. The TS3USB3000 devices will not tolerate a negative voltage swing so you will need to bias your signal so it will remain above 0V if you are AC coupling.