85320AIL Ver la hoja de datos (PDF) - Integrated Device Technology
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85320AIL Datasheet PDF : 16 Pages
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ICS85320I
LVCMOS/LVTTL-TO-DIFFERENTIAL 3.3V, 2.5V LVPECL TRANSLATOR
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
50Ω to V - 2V. For V = 2.5V, the V - 2V is very close to ground
CC
CC
CC
level. The R3 in Figure 2B can be eliminated and the termination
is shown in Figure 2C.
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
VCC=2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driv er
2.5V
+
-
R1
R2
50
50
R3
18
FIGURE 2A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
FIGURE 2B. 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 2C. 2.5V LVPECL TERMINATION EXAMPLE
IDT™ / ICS™ 3.3V, 2.5V LVPECL TRANSLATOR
8
ICS8532AMI REV A NOVEMBER 13, 2006
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