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30 SOM-4450 User's Manual
C.1 LVDS Introduction
When you mention the impressive data rate of 400 Mbps at 15 meters
for LVDS, you immediately realize how significant the differences are
between analog and digital interfaces. There are several other factors
other than significantly increased data transfer rate and image quality
that make LVDS (Low-Voltage Differential Signaling) very attractive to
industrial users. One is that LVDS drivers and receivers maintain
excellent signal levels and performance while operating on supply
voltages as low as 2 V. This low voltage allows LVDSs to operate
independently from the main power supply voltage. Another factor is
that LVDS drivers and receivers have a low swing voltage. This
voltage is typically around 345 mV. This allows LVDS devices to
achieve high speeds while using relatively little power. This low
differential swing voltage together with self-canceling EMI, reduces
EMI problems significantly. This is especially important in space-
critical applications. This is also why LVDS has already been widely
used in Notebook computer panel connections.
All Digital Benefits
No matter which digital standard an end user uses for their industrial
applications, it will have to provide the following criteria. Be compati-
ble so that system and display products from different suppliers can
be made available in an open market. Become a standard for the
electronics and PC industry. Be able to transmit data over standard
twisted pair cables as well as fiber optic. Maintain a low bit error rate
for high quality image while operating at a very low power level. Be
scalable.
Expanded Applications
With flat panel displays already a common part of our everyday lives
at work, home and industrial/commercial settings, deciding on a
standard is a monumental decision that will affect all our lives.
Engineers will have to champion their cause by applying both of these
digital panel technologies to many practical products. Thus enabling
the end user, whether it be in an industrial setting or a consumer
setting, to benefit from both of these technologiesprocessor of choice.