844S012 Datasheet, PDF (15/24 Pages) Integrated Device Technology – Crystal-to-LVDS/LVCMOS Frequency Synthesizer

844S012 Data Sheet
CRYSTAL-TO-LVDS/LVCMOS FREQUENCY SYNTHESIZER
LVDS Driver Termination
A general LVDS interface is shown in Figure 4. Standard termination
for LVDS type output structure requires both a 100 parallel resistor
at the receiver and a 100 differential transmission line environment.
In order to avoid any transmission line reflection issues, the 100
resistor must be placed as close to the receiver as possible. IDT
offers a full line of LVDS compliant devices with two types of output
structures: current source and voltage source. The standard
termination schematic as shown in Figure 4 can be used with either
type of output structure. If using a non-standard termination, it is
recommended to contact IDT and confirm if the output is a current
source or a voltage source type structure. In addition, since these
outputs are LVDS compatible, the input receivers amplitude and
common mode input range should be verified for compatibility with
the output.
LVDS Driver
100Ω
+
LVDS
Receiver
–
100Ω Differential Transmission Line
Figure 4. Typical LVDS Driver Termination
844S012 REVISION B 08/25/15
15
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