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5P49V5935 Datasheet(PDF) 27 Page - Integrated Device Technology

Part No. 5P49V5935
Description  Generates up to four independent output frequencies
Download  33 Pages
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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5P49V5935 Datasheet(HTML) 27 Page - Integrated Device Technology

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REVISION B 07/13/15
27
PROGRAMMABLE CLOCK GENERATOR
5P49V5935 PRELIMINARY DATASHEET
Termination for 2.5V LVPECL Outputs
Figures 2.5V LVPECL Driver Termination Example (1) and (2)
show examples of termination for 2.5V LVPECL driver. These
terminations are equivalent to terminating 50
 to VDDO – 2V.
For VDDO = 2.5V, the VDDO – 2V is very close to ground level.
The R3 in Figure 2.5V LVPECL Driver Termination Example
(3)
can be eliminated and the termination is shown in example
(2).
2.5V LVPECL Driver Termination Example (1)
2.5V LVPECL Driver Termination Example (2)
2.5V LVPECL Driver Termination Example (3)
2.5V LVPECL
Driver
Zo=50ohm
Zo=50ohm
2.5V
+
-
R2
R4
VDDO = 2.5V
62.5ohm
62.5ohm
2.5V
R1
R3
250ohm
250ohm
2.5V LVPECL
Driver
Zo=50ohm
Zo=50ohm
2.5V
+
-
R1
R2
VDDO = 2.5V
50ohm
50ohm
2.5V LVPECL
Driver
Zo=50ohm
Zo=50ohm
2.5V
+
-
R1
R2
VDDO = 2.5V
50ohm
50ohm
R3
18ohm


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