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Is the DS90LV048A internally biased?

jerome.rivest
Prodigy 10 points
Other Parts Discussed in Thread: DS90LV048A, DS90LV047A

Hello,

I'm currently designing a AC-Coupled LVDS link over short run of Ethernet cable and I was considering using the 

DS90LV047A driver and the DS90LV048A receiver. I read about the need of a biasing network to set common mode voltage when an AC-coupled link is used and that the LVDS input doesn't provide one.

My question is: Does the DS90LV048A receiver provide internal bias? I've been scanning the datasheet for a while and cannot figure it out.

Thanks for you help,

Jérôme

  • 0
    TI__Genius 13475 points

    We provide a very small amount of differential bias so that if the two inputs are at the same voltage (which you would expect if you are AC coupled and then have the termination resistor at the inputs to the part), then the part won't flotch around.  

    If in your application you anticipate that the driver will not be switching for a period of time, then you need to think about what you want the output of the 'LV048 to be doing during that time, normally the device will be biased such that it will provide a HIGH output - if there is a lot of noise around the cable, then there may be enough to induce some switching and you will want to add external biasing, but without noise, no additional external biasing should be required.