ICS844001AG-21LF datasheet(11/17 Pages) IDT

Part #	ICS844001AG-21LF

Description	FEMTOCLOCKS??CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

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Manufacturer	IDT [Integrated Device Technology]

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ICS844001AG-21 REV. A SEPTEMBER 14, 2007

ICS844001-21

FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

PRELIMINARY

SCHEMATIC EXAMPLE

Figure 5 shows an example of ICS844001-21 application

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

DD

= 3.3V.

The 18pF parallel resonant 25MHz crystal is used. The C1 = 22pF

and C2 = 22pF are recommended for frequency accuracy. For

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

optimizing frequency accuracy. One example of LVDS and one

example of LVCMOS terminations are shown in this schematic.

The decoupling capacitors should be located as close as possible

to the power pin.

FIGURE 5. ICS844001-21 SCHEMATIC LAYOUT

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