ICS843SDN datasheet(8/14 Pages) IDT

tên linh kiện	ICS843SDN

Giải thích chi tiết về linh kiện	FEMTOCLOCK??CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR

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ICS843SDN

FEMTOCLOCK™CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR

IDT™ / ICS™ 3.3V LVPECL CLOCK GENERATOR

ICS843SDNAG REV. A FEBRUARY 19, 2009

Schematic Example

Figure 5A shows an example of the ICS843SDN application

schematic. In this example, the device is operated at VCC = 3.3V.

The 18pF parallel resonant crystal is used. The C1 = 27pF and C2

= 27pF are recommended for frequency accuracy. For a different

board layout, the C1 and C2 values may be slightly adjusted for

optimizing frequency accuracy. Two examples of LVPECL

terminations are shown in this schematic. Additional approaches

are shown in the LVPECL Termination Application Note.

Figure 5A. ICS843SDN Schematic Example

VCC

Zo = 50 Ohm

VCC

1 8 p F

XTAL_OUT

133

Zo = 50 Ohm

0.01u

82.5

Zo = 50 Ohm

VCCA

VEE

XTAL_OUT

XTAL_IN

VCC

XTAL_IN

25MHz

82.5

27pF

3.3V

10uF

VCC=3.3V

Optional

Y-Termination

Zo = 50 Ohm

VCC

VCCA

27pF

133

0.01u

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