ICS84314AY-02LFT 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS84314AY-02LFT

700MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS84314-02

700MHZ, CRYSTAL-TO-3.3V/2.5V LVPECL

FREQUENCY SYNTHESIZER W/FANOUT BUFFER

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 5A and Figure 5B show examples of termination for

2.5V LVPECL driver. These terminations are equivalent to ter-

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

close to ground level. The R3 in Figure 5A can be eliminated

and the termination is shown in Figure 5C.

VCCO=2.5V

Zo = 50 Ohm

Zo = 50 Ohm

2,5V LVPECL

Driv er

2.5V

+

-

R1

R2

50

50

R3

18

VC C O=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 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

FIGURE 5B. 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 5C. 2.5V LVPECL TERMINATION EXAMPLE

84314AY-02

www.icst.com/products/hiperclocks.html

11

REV. B NOVEMBER 17, 2005

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