843201-375 Datasheet, PDF (12/19 Pages) Integrated Device Technology – FemtoClock® Crystal-to-LVPECL 375MHz Frequency Margining Synthesizer

843201-375 DATA SHEET
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 3A and Figure 3B show examples of termination for
2.5V LVPECL driver. These terminations are equivalent to
terminating 50Ω to V - 2V. For V = 2.5V, the V - 2V is
CC
CC
CC
very close to ground level. The R3 in Figure 3B can be
eliminated and the termination is shown in Figure 3C.
VCC=2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driv er
2.5V
R1
R3
250
250
2.5V
+
-
R2
62.5
R4
62.5
FIGURE 3A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
VCC=2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driv er
2.5V
+
-
R1
R2
50
50
R3
18
FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
VCC=2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driv er
2.5V
+
-
R1
R2
50
50
FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE
FEMTOCLOCK® CRYSTAL-TO-LVPECL
12
375MHZ, FREQUENCY MARGINING SYNTHESIZER
REVISION A 8/21/15