ICS421004AI01 datasheet(10/13 Pages) ICST

No de pièce	ICS421004AI01

Description	FEMTOCLOCKS??CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER

PDF	13 Pages

Scroll/Zoom	100%

Fabricant	ICST [Integrated Circuit Systems]

Site Internet	http://www.icst.com

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10 / 13 page

8421004AGI-01

www.icst.com/products/hiperclocks.html

REV. A MACH 29, 2005

Integrated

Circuit

Systems, Inc.

ICS8421004I-01

FEMTOCLOCKS™CRYSTAL-TO-

HSTL FREQUENCY SYNTHESIZER

PRELIMINARY

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

HSTL output driver circuit and termination are shown in

Figure 3.

To calculate worst case power dissipation into the load, use the following equations which assume a 50

Ω load.

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = (V

OH_MIN

) * (V

DD_MAX

- V

OH_MIN

)

Pd_L = (V

OL_MAX

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1V/50

Ω) * (2V - 1V) = 20mW

Pd_L = (0.4V/50

Ω) * (2V - 0.4V) = 12.8mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW

FIGURE 3. HSTL DRIVER CIRCUIT AND TERMINATION

DDO

OUT

ICS421004AI01 Fiches technique(PDF) 10 Page - Integrated Circuit Systems