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FIN1108MTD Datenblatt(PDF) 3 Page - Fairchild Semiconductor

Teilenummer FIN1108MTD
Bauteilbeschribung  LVDS 8 Port High Speed Repeater
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FIN1108MTD Datenblatt(HTML) 3 Page - Fairchild Semiconductor

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Applications
Signal Optimization via Internal Termination
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, usu-
ally 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 termina-
tion 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/disadvan-
tages 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-to-
point 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.
Advantages:
Disadvantages:
1. Reduced device count resulting in reduced board space
and production cost.
1. Without special process treatment, on-chip termination can
experience greater temperature variation. This is usually
tolerable for low speed applications that have a sufficient
unit interval.
2. Reduced reflections caused by the stub length on the
receiver inputs, improving the signal integrity.
2. For applications with high common-mode noise, a center
tapped capacitor at the receiver side is desirable to filter
out the common-mode voltage noise of the input LVDS sig-
nal. This scheme works for an external termination scheme
with two (50
Ω each for nominal 100Ω termination resistor)
half-value termination resistors connected in series and
center tapped to a capacitor to Ground. To implement this
scheme using internal termination resistors, a center tap
pin would have to be used. This would increase the pack-
age size of the part.


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