ICS843246BGI datasheet(10/17 Pages) IDT

Part #	ICS843246BGI

Description	FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

PDF	17 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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10 / 17 page

IDT™ / ICS™ 3.3V LVPECL FREQUENCY SYNTHESIZER

ICS843246BGI REV. A AUGUST 2, 2007

ICS843246I

FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER

TERMINATION FOR 2.5V LVPECL OUTPUT

Figure 4A and Figure 4B show examples of termination for 2.5V

LVPECL dr iver. These ter minations are equivalent to

terminating 50

Ω to V

- 2V. For V

= 2.5V, the V

- 2V is very

close to ground level. The R3 in Figure 4B can be eliminated

and the termination is shown in Figure 4C.

Zo = 50 Ohm

VCCO=2.5V

Zo = 50 Ohm

2.5V

2,5V LVPECL

Driv er

FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

VCCO=2.5V

Zo = 50 Ohm

2,5V LVPECL

Driv er

Zo = 50 Ohm

2.5V

FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

62.5

2.5V

2,5V LVPECL

Driv er

250

Zo = 50 Ohm

62.5

2.5V

250

VCCO=2.5V

FIGURE 4C. 2.5V LVPECL DRIVER TERMINATION EXAMPLE

ICS843246BGI Datasheet(PDF) 10 Page - Integrated Device Technology