8T49N281_16 Datasheet, PDF (52/67 Pages) Integrated Device Technology – FemtoClock NG Octal Universal Frequency Translator

8T49N281 Datasheet
Termination for 2.5V LVPECL Outputs
Figure 11A and Figure 11C show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating 50
to V_CCO – 2V. For V_CCO = 2.5V, the V_CCO – 2V is very close to ground
level. The R3 in Figure 11C can be eliminated and the termination is
shown in Figure 11B.
VCCO = 2.5V
50
50
2.5V LVPECL Driver
2.5V
R1
R3
250
250
2.5V
+
–
R2
R4
62.5
62.5
VCCO = 2.5V
50
50
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50
50
R3
18
Figure 11A. 2.5V LVPECL Driver Termination Example
Figure 11C. 2.5V LVPECL Driver Termination Example
V_CCO = 2.5V
50
50
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50
50
Figure 11B. 2.5V LVPECL Driver Termination Example
©2016 Integrated Device Technology, Inc.
52
Revision 7, October 26, 2016