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SN65LVDM1676: Multipoint application

Danilo A.
Mastermind 28680 points
Part Number: SN65LVDM1676

Hi Team,

Our customer would like to know if the SN65LVDM1676DGG will work in a multipoint application with the condition stated below.

We are working on a new design. We are looking at using your SN65LVDM1676DGG. Our design has multipoint drops (8) and is usually terminated with a 120 ohm single resistor. Will this product work in a multipoint operation?

We have 8 (16 bit) nodes that are bidirectional and on the same cable. We were planning on using quantity of 8  SN65LVDM1676DGG one for each node. From the data sheet it looks like the SN65LVDM1677DGG has a built-in 100 ohm resistor for each of the 16 bits. This would not work with 8 nodes. This is why I thought the SN65LVDM1676DGG would be a better fit. It does not have built-in terminators???? I could select the terminator used.
Regards,
Danilo
  • +1
    TI__Mastermind 22790 points

    Hello Danilo,

    Our LVDM product family increases the current drive from ~3.5mA to ~6mA when compared to LVDS. With this increase, the SN65LVDM1676 can support multipoint but for very light loaded buses. There is some concern about the capability to drive 8 nodes, since a low loaded impedance can force the signal swing to be too small.

    Another solution would be M-LVDS. These devices have 9 to 13 mA of drive current and are designed for heavily loaded backplanes (can support up to 32 nodes).

    Regards,

    Josh