Circuit Protection of VGA Port
The signal lines used in a VGA port have a maximum frequency of 25 MHz, and are 0.7 Vp-p for R, G, and B lines, and 0.3 to 5.0 Vp-p for ID01, ID02, ID03, H-sync and V-sync. For these lines, the capacitance of the suppress needs to be taken into account.
As shown at the left, discrete multilayer varistors can be used for board layout flexibility, or to reduce part count, two rail clamp devices can be used.
Does not apply.
The IEC 61000-4-2 will be the most appropriate standard that applies for this port. It supplies a test method for verifying that the end product is not susceptible to ESD events.
Unique Features:Does not apply.
Application Warnings:Does not apply.