ICS84427 Datasheet, PDF (8/13 Pages) Integrated Circuit Systems – CRYSTAL-TO-LVDS INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84427
CRYSTAL-TO-LVDS
INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER
LVDS DRIVER TERMINATION
A general LVDS interface is shown in Figure 3. In a 100Ω differ-
ential transmission line environment, LVDS drivers require a
matched load termination of 100Ω across near the receiver in-
put. For a multiple LVDS outputs buffer, if only partial outputs
are used, it is recommended to terminate the un-used outputs.
3.3V
LVDS_Driv er
3.3V
+
R1
100
-
100 Ohm Differiential Transmission Line
FIGURE 3. TYPICAL LVDS DRIVER TERMINATION
RECOMMENDATIONS FOR UNUSED OUTPUT PINS
OUTPUTS:
LVDS
All unused LVDS output pairs can be either left floating or
terminated with 100Ω across. If they are left floating, we
recommend that there is no trace attached.
84427CM
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8
REV. D NOVEMBER 30, 2005