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843204AGIT Datasheet(PDF) 11 Page - Integrated Device Technology |
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843204AGIT Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 16 page IDT™ / ICS™ 3.3V LVPECL FREQUENCY SYNTHESIZER 11 ICS843204AGI REV. A MARCH 18, 2009 ICS843204I FEMTOCLOCK™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER 3. Calculations and Equations. The purpose of this section is to derive the power dissipated into the load. LVPECL output driver circuit and termination are shown in Figure 5. To calculate worst case power dissipation into the load, use the following equations which assume a 50 Ω load, and a termination voltage of V CCO – 2V. • For logic high, V OUT = V OH_MAX = V CCO_MAX – 0.9V (V CCO_MAX – V OH_MAX ) = 0.9V • For logic low, V OUT = V OL_MAX = V CCO_MAX – 1.7V (V CCO_MAX – V OL_MAX ) = 1.7V 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 CCO_MAX – 2V))/R L ] * (V CCO_MAX – V OH_MAX ) = [(2V – (V CCO_MAX – V OH_MAX ))/R L ] * (V CCO_MAX – V OH_MAX ) = [(2V – 0.9V)/50 Ω] * 0.9V = 19.8mW Pd_L = [(V OL_MAX – (V CCO_MAX – 2V))/R L ] * (V CCO_MAX – V OL_MAX ) = [(2V – (V CCO_MAX – V OL_MAX ))/R L ] * (V CCO_MAX – V OL_MAX ) = [(2V – 1.7V)/50 Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW FIGURE 5. LVPECL DRIVER CIRCUIT AND TERMINATION Q1 V OUT V CCO RL 50 V CCO - 2V |
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