ICS1002AI01L datasheet(10/13 Pages) ICST

tên linh kiện	ICS1002AI01L

Giải thích chi tiết về linh kiện	FEMTOCLOCKS??CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER

PDF	13 Pages

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nhà sản xuất	ICST [Integrated Circuit Systems]

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10 / 13 page

8421002AGI-01

www.icst.com/products/hiperclocks.html

REV. A FEBRUARY 6, 2006

Integrated

Circuit

Systems, Inc.

ICS8421002I-01

FEMTOCLOCKS™CRYSTAL-TO-

HSTL FREQUENCY SYNTHESIZER

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_MAX

) * (V

DD_MAX

- V

OH_MAX

)

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

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