Intel® Agilex™ General-Purpose I/O and LVDS SERDES User Guide

ID 683780
Date 10/29/2021
Public

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3.2.1. External I/O Termination

Analyze the LVDS interface's electrical specification requirement and ensure the common-mode voltage requirement based on your selected LVDS data rate meets the specification in the device data sheet. Use AC coupling and external voltage bias circuitry if the common-mode voltage of the output buffer does not match the differential receiver input common-mode voltage. Consider using a dedicated VICM voltage supply for wide LVDS interfaces that share a common VICM reference voltage. For more information about the VICM specification, refer to the device data sheet.

Note: Intel recommends to use SPICE or IBIS models to verify your AC-coupled or DC-coupled termination.
Figure 44. AC-Coupled External Termination
Figure 45. AC-Coupled External Termination for 1.2 V VCCIO_PIO

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