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ICS8421002AI Datasheet(PDF) 10 Page - Integrated Circuit Systems |
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ICS8421002AI Datasheet(HTML) 10 Page - Integrated Circuit Systems |
10 / 13 page 8421002AGI www.icst.com/products/hiperclocks.html REV. A FEBRUARY 7, 2006 10 Integrated Circuit Systems, Inc. ICS8421002I 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 /R L ) * (V DD_MAX - V OH_MAX ) Pd_L = (V OL_MAX /R L ) * (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 V DDO V OUT RL 50 Ω Q1 |
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