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CDCLVP1102RGTR Datasheet(PDF) 12 Page - Texas Instruments

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Part # CDCLVP1102RGTR
Description  Two LVPECL Output, High-Performance Clock Buffer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

CDCLVP1102RGTR Datasheet(HTML) 12 Page - Texas Instruments

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Board
Supply
Chip
Supply
C
10 F
m
C
1 F
m
C
0.1 F
m
FerriteBead
V
CC
(a) Output DC Termination
(b) Output AC Termination
CDCLVP1102
LVPECL
86 W
86 W
50 W
50 W
V
BB
CDCLVP1102
LVPECL
250 W
62.5 W
250 W
62.5 W
V
CC
V
CC
CDCLVP1102
SCAS884C
– AUGUST 2009 – REVISED AUGUST 2011
www.ti.com
Figure 13 illustrates this recommended power-supply decoupling method.
Figure 13. Power-Supply Decoupling
LVPECL Output Termination
The CDCLVP1102 is an open emitter for LVPECL outputs. Therefore, proper biasing and termination are
required to ensure correct operation of the device and to minimize signal integrity. The proper termination for
LVPECL outputs is a 50
Ω to (VCC –2) V, but this dc voltage is not readily available on PCB. Therefore, a
Thevenin equivalent circuit is worked out for the LVPECL termination in both direct-coupled (dc) and ac-coupled
configurations. These configurations are shown in Figure 14a and b for VCC = 2.5 V and Figure 15a and b for VCC
= 3.3 V, respectively. It is recommended to place all resistive components close to either the driver end or the
receiver end. If the supply voltage for the driver and receiver is different, ac coupling is required.
Figure 14. LVPECL Output DC and AC Termination for VCC = 2.5 V
12
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Copyright
© 2009–2011, Texas Instruments Incorporated
Product Folder Link(s): CDCLVP1102


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