LVCMOS/LVTTL-TO-DIFFERENTIAL

3.3V, 2.5V LVPECL TRANSLATOR

85320 DATA SHEET

8

REVISION B 12/19/14

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 2A and Figure 2B show examples of termination for 2.5V

LVPECL driver. These terminations are equivalent to terminating

50

Ω to V

CC

- 2V. For V

CC

= 2.5V, the V

CC

- 2V is very close to ground

level. The R3 in Figure 2B can be eliminated and the termination

is shown in Figure 2C.

FIGURE 2B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

FIGURE 2A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

R2

62.5

Zo = 50 Ohm

R1

250

+

-

2.5V

2,5V LVPECL

Driv er

R4

62.5

R3

250

Zo = 50 Ohm

2.5V

VCC=2.5V

R1

50

R3

18

Zo = 50 Ohm

Zo = 50 Ohm

+

-

2,5V LVPECL

Driv er

VCC=2.5V

2.5V

R2

50

2,5V LVPECL

Driv er

VCC=2.5V

R1

50

R2

50

2.5V

Zo = 50 Ohm

Zo = 50 Ohm

+

-

FIGURE 2C. 2.5V LVPECL TERMINATION EXAMPLE