LVDS transmitter output resistor

[ikessimoPerdigo]

Hello,

I'm working on a schematic where an LVDS transmitter (DS90C385AMT_NOPB) connects to a display through a connector. In my design, a 100-ohm termination resistor is placed between the differential pairs TXOUT and RXIN, as shown in the second image below. This matches the configuration in the "16 Grayscale" test pattern figure from the DS90C385A datasheet (Figure 3).

Could someone confirm if this is the correct approach for termination? Specifically, is the placement and value of the 100-ohm resistor between TXOUT+ and TXOUT- suitable in this configuration for ensuring proper impedance matching and signal integrity?

 

[Uwe Bonnes]

LVDS is unidirectional and the termination resistor needs to be place as near as possible to the sink. If sink is on a remote board and the resistor is placed on the local board with the source, this is wrong.

[ikessimoPerdigo]

Hello Uwe, thanks for your response.

The connector is directly interfaced to a Riverdi Screen via an FPC connector, so that the resistors will be placed between the FPC and the display. Is there any detail else I should know?

Thank you again