FIN1108T

For LVDS signaling in point-to-point applications, receivers or repeaters with on-chip termination are preferable to reduce the overshoot or undershoot due to the reflection caused by stubs at receiver inputs. As a rule of thumb, usually the termination resistor for an LVDS receiver should be placed as close as possible to the receiver, especially for high speed applications. If the distance between termination resistors and receivers is too long, the interconnection will be seen as an un-terminated stub which can produce reflections resulting in higher EMI. Internal termination can effectively smooth out this ringing which can otherwise jeopardize the receiver noise margin. This is important for reliable high-speed operation with tighter required signal settling times. Below is a list of the advantages/disadvantages of internal termination.

Internal termination is not suitable for all applications. In order to set a proper VOD at the driver outputs, receivers with on-chip termination resistors only work for point-topoint applications since multi-drop applications would require termination resistor for each receiver, reducing the equivalent termination to RT/n. This would reduce the driver output swing by n.

This 8 port repeater FIN1108T is designed for high speed interconnectsutilizing Low Voltage Differential Signaling (LVDS)technology.

The FIN1108T accepts and outputs LVDS levels with a typicaldifferential output swing of 330 mV which provides lowEMI at ultra low power dissipation even at high frequencies.The FIN1108 provides a VBB reference for AC couplingon the inputs. In addition the FIN1108 can directlyaccept LVPECL, HSTL, and SSTL-2 for translation toLVDS.

The FIN1108T has internal termination across the receiverinputs for reduced part count, reduced stub length and betternoise immunity. See Applications section.