ICS8N3PG10MBKI-062 Datasheet, PDF (14/20 Pages) Integrated Device Technology – One differential LVPECL output pair

ICS8N3PG10MBKI-062 DATA SHEET
Termination for 2.5V LVPECL Outputs
Figure 6A and Figure 6C show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminating 50
to V_CC – 2V. For V_CC = 2.5V, the V_CC – 2V is very close to ground
level. The R3 in Figure 6B can be eliminated and the termination is
shown in Figure 6C.
V_CC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
R1
250Ω
R3
250Ω
2.5V
+
–
R2
62.5Ω
R4
62.5Ω
V_CC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50Ω
50Ω
R3
18Ω
Figure 6A. 2.5V LVPECL Driver Termination Example
Figure 6C. 2.5V LVPECL Driver Termination Example
VCC = 2.5V
50Ω
50Ω
2.5V LVPECL Driver
2.5V
+
–
R1
R2
50Ω
50Ω
Figure 6B. 2.5V LVPECL Driver Termination Example
PROGRAMMABLE FEMTOCLOCK^® NG DIFFERENTIAL-TO-3.3V, 2.5V
14
LVPECL SYNTHESIZER
REV A 05/15/14