Si5332 Data Sheet
Functional Description
3.3V
LVPECL
RTT = 54Ω
Zo=50Ω
Zo=50Ω
R1
50Ω
3.3V
+
-
R2
50Ω
Input
RTT Vcc-2V
Figure 3.7. 3.3 V LVPECL Output Termination, Option 1
3.3V
3.3V
R3
125Ω
R4
125Ω
3.3V
Zo=50Ω
+
LVPECL
Zo=50Ω
R1
84Ω
-
R2
84Ω
Input
Figure 3.8. 3.3 V LVPECL Output Termination, Option 2
Termination for 2.5 V LVPECL Outputs
Figure 3.9 2.5 V LVPECL Termination Example, Option 1 on page 14 and Figure 3.10 2.5 V LVPECL Termination Example, Option 2
on page 14 show examples of termination for the 2.5 V LVPECL driver option. These terminations are equivalent to terminating 50 Ω
to VDDO – 2 V. For VDDO = 2.5 V, the VDDO – 2 V is very close to ground level. The R3 in Figure 3.10 2.5 V LVPECL Termination
Example, Option 2 on page 14 can be optionally eliminated using the termination shown in Figure 3.9 2.5 V LVPECL Termination
Example, Option 1 on page 14.
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