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TMUX1109: Question asymmetric power supply and delta Rdson

Wayne Wang20
Expert 4380 points
Part Number: TMUX1109

Hi team,

My customer is evaluating our TMUX1109 in a water meter project. The use case is as below picture. The 'send' signal is from 0V~3.6V. The receive signal is from -1V~+1V. So the total input range for TMUX1109 is from -1V~3.6V. So we have to use dual power supply. So i just want to check with you that if we can use a asymmetric power supply like Vss=-1V and VDD=4V? 

 

Another question is that we claims a delta Rdson as below picture. I am not sure this is the difference between S1A and S2A or between S1A and S1B? Customer cares more about the delta Rdson between 'send' channel and 'receive' channel. So hope you could help explain on this. Thanks.

Best regards,

Wayne

  • 0
    TI__Expert 3900 points

    Hi Wayne,

    Yes, the TMUX1109 can support asymetirc power supply rails as you mentioned.I tested the supply conditions you mentioned in the lab today and measured supply current around 5nA at 25°C.

    The delta Ron spec is the difference between any of the channels. This takes into account the measurements of S1A to S2A AND S1A to S1B. However, since you are using a supply of +4V and -1V, that is a total difference of 5V between VDD and VSS. This means your specs will be most similar to the 5V table or the ±2.5V supply table. This means your delta RON values are actually better than what you have shown in your image. 

    This device is the best fit for your application.