AN-5048 Datasheet, PDF (3/3 Pages) Fairchild Semiconductor – System Clock Distribution Example Using LVDS

Summary and Conclusions
LVDS differential lines have equal but opposite currents.
When the fields created by these odd-mode signals are
closely coupled, they will cancel each other and reduce
interference with adjacent PCB traces. Because of this it is
important to maintain a balanced and closely coupled dif-
ferential transmission path to reduce EMI emissions. LVDS
signals also have the advantage of tolerating interference
from outside sources such as inductive radiation from elec-
tric motors or crosstalk from neighboring transmission
lines. System designers who need to move high speed
clock signals across cable or PCB with minimal EMI and a
high level of noise immunity can benefit from LVDS tech-
nology.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
3
www.fairchildsemi.com