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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS002AI40L датащи(PDF) 19 Page - Integrated Device Technology |
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ICS002AI40L датащи(HTML) 19 Page - Integrated Device Technology |
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19 / 23 page  ICS843002I-40 175MHZ, FEMTOCLOCKS™ VCXO BASED SONET/SDH JITTER ATTENUATOR IDT™ / ICS™ VCXO BASED SONET/SDH JITTER ATTENUATOR 19 ICS843002AKI-40 REV. A NOVEMBER 7, 2007 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 8. Figure 8. LVPECL Driver Circuit and Termination To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of VCCO – 2V. • For logic high, VOUT = VOH_MAX = VCCO_MAX – 0.9V (VCCO_MAX – VOH_MAX) = 0.9V • For logic low, VOUT = VOL_MAX = VCCO_MAX – 1.7V (VCCO_MAX – VOL_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 = [(VOH_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOH_MAX) = [(2V - (VCCO_MAX – VOH_MAX))/RL] * (VCCO_MAX – VOH_MAX) = [(2V - 0.9V)/50 Ω] * 0.9V = 19.8mW Pd_L = [(VOL_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOL_MAX) = [(2V – (VCCO_MAX – VOL_MAX))/RL] * (VCCO_MAX – VOL_MAX) = [(2V – 1.7V)/50 Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW V OUT V CCO V CCO - 2V Q1 RL 50 Ω |
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