AS1156 austriamicrosystems AG, AS1156 Datasheet - Page 11

• Manufacturer Part Number: AS1156
• Description: Single/Dual LVDS Driver
• Manufacturer: austriamicrosystems AG

AS1156/AS1154
Data Sheet - A p p l i c a t i o n s
Board Layout
The device should be placed as close to the interface connector as possible to minimize LVDS trace length.
Figure 20. Driver Propagation Delay and Transition Time Waveforms
Figure 21. Driver Propagation Delay and Transition Time Test Circuit
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Keep the LVDS and any other digital signals separated from each other to reduce crosstalk.
Use a four-layer PC board that provides separate power, ground, LVDS signals, and input signals.
Isolate the input LVDS signals from each other and the output LVCMOS/LVTTL signals from each other to prevent
Separate the input LVDS signals from the output signals planes with the power and ground planes for best results.
coupling.
OUTx+
OUTx-
INx
Generator
20%
t
PLHD
1.5V
t
TLH
50Ω
0 Differential
80%
0
Revision 1.01
V
DIFF
= (V
OUT
x
C
+
L
) - (V
OUT
x
-
)
80%
R
L
t
PHLD
1.5V
OUTx+
OUTx-
t
THL
0
0
0
20%
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V
V
OL
OH
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