5322AMI Просмотр технического описания (PDF) - Integrated Circuit Systems

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5322AMI

DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL 2.5V / 3.3V LVPECL TRANSLATOR

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

ICS85322I

DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL

2.5V / 3.3V 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 terminat-

ing 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very close to

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

termination is shown in Figure 2C.

VCCO=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

VCCO=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

VCCO=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

85322AMI

www.icst.com/products/hiperclocks.html

7

REV. B OCTOBER 7, 2003

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