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THVD2450V-EP: RS-422 @ 40Mbps on 30m cable

Jonah Yu
Prodigy 30 points

Part Number: THVD2450V-EP

Our team is looking for an RS-422 transceiver that has these specs:

40Mbps

3.3 and 5V input range

30m of cable length

 

Looking at the datasheet for THVD2450V-EP, it seems it should allow for these specs. However in Figure 8-2 of the datasheet, the cable length should be practically 0 for data rates above 10Mbps. Is this plot just for the slower data rate models? Is there a plot I can reference for the 50Mbps model (THVD2450V-EP)? image.png

  • 0
    TI__Mastermind 26872 points

    Hi Jonah,

    That plot is just the standard RS-485 plot for all transceivers showing the typical cable length/data rate trade-offs. I believe it actually is sourced from the original RS-485 standard.

    But for this transceiver it does not apply. Many modern transceivers, including our THVD24xx family, support those higher data rates. The cable length requirements will still be shorter to achieve those high data rates of course. But due to the stronger and cleaner switching rates of RS-485 drivers, those higher data rates are now possible. 

    THVD2450V-EP is a good choice here, but note that it is half-duplex and not full duplex. Typically full-duplex transceivers are used in RS-422 applications. In that case, you can use our THVD2452V-EP transceiver instead. 

    Best,

    Ethan