ICS44004AI04L datasheet(7/13 Pages) ICST

tên linh kiện	ICS44004AI04L

Giải thích chi tiết về linh kiện	FEMTOCLOCKS??CRYSTAL/LVCMOS-TO-LVDS FREQUENCY SYNTHESIZER

PDF	13 Pages

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844004AGI-04

www.icst.com/products/hiperclocks.html

REV. A JANUARY 26, 2006

Integrated

Circuit

Systems, Inc.

ICS844004I-04

FEMTOCLOCKS™CRYSTAL/LVCMOS-TO-

LVDS FREQUENCY SYNTHESIZER

PRELIMINARY

CRYSTAL INPUT INTERFACE

The ICS844004I-04 has been characterized with 18pF

parallel resonant crystals. The capacitor values shown in

Figure 2 below were determined using a 19.44MHz 18pF

parallel resonant crystal and were chosen to minimize

the ppm error.

APPLICATION INFORMATION

As in any high speed analog circuitry, the power supply pins

are vulnerable to random noise. The ICS844004I-04 provides

separate power supplies to isolate any high switching

noise from the outputs to the internal PLL. V

DD, VDDA, and VDDO

should be individually connected to the power supply

plane through vias, and bypass capacitors should be

used for each pin. To achieve optimum jitter performance,

power supply isolation is required. Figure 1 illustrates how

a 10

Ω resistor along with a 10µF and a .01μF bypass

capacitor should be connected to each V

DDA.

POWER SUPPLY FILTERING TECHNIQUES

FIGURE 1. POWER SUPPLY FILTERING

DDA

μF

.01

μF

3.3V

.01

μF

ICS84332

XTAL_IN

XTAL_OUT

18pF Parallel Cry stal

22p

Figure 2. CRYSTAL INPUt INTERFACE

ICS844004I-04

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