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ICS853111AV-01LF Datasheet(PDF) 11 Page - Integrated Circuit Systems |
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ICS853111AV-01LF Datasheet(HTML) 11 Page - Integrated Circuit Systems |
11 / 15 page 853111AV-01 www.icst.com/products/hiperclocks.html REV. A APRIL 25, 2005 11 Integrated Circuit Systems, Inc. ICS853111-01 LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL/ECL FANOUT BUFFER 3. Calculations and Equations. 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 – 0.935V (V CCO_MAX - V OH_MAX ) = 0.935V • For logic low, V OUT = V OL_MAX = V CCO_MAX – 1.67V (V CCO_MAX - V OL_MAX ) = 1.67V 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 - 0.935V)/50 Ω] * 0.935V = 19.92mW 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 - 1.67V)/50 Ω] * 1.67V = 11.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW Figure 5. LVPECL Driver Circuit and Termination VCCO - 2V Q1 VOUT RL 50 VCCO |
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