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## 84330CI Datasheet(PDF) 14 Page - Integrated Device Technology

 Part No. 84330CI Description 720MHz, Low Jitter, Crystal-to-LVPECL Frequency Synthesizer Download 20 Pages Scroll/Zoom 100% Manufacturer IDT [Integrated Device Technology] Direct Link http://www.idt.com Logo ## 84330CI Datasheet(HTML) 14 Page - Integrated Device Technology           14 / 20 page 14©2016 Integrated Device Technology, IncRevision A January 13, 201684330CI Data Sheet3. Calculations and Equations.The purpose of this section is to calculate the power dissipation for the LVPECL output pair.LVPECL output driver circuit and termination are shown in Figure 7.Figure 7. LVPECL Driver Circuit and TerminationTo calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage ofVCC - 2V.•For logic high, VOUT = VOH_MAX = VCC_MAX - 0.9V(VCC_MAX - VOH_MAX) = 0.9V•For logic low, VOUT = VOL_MAX = VCC_MAX - 1.7V(VCC_MAX - VOL_MAX) = 1.7VPd_H is power dissipation when the output drives high.Pd_L is the power dissipation when the output drives low.Pd_H = [(VOH_MAX - (VCC_MAX -2V))/RL] * (VCC_MAX - VOH_MAX) = [(2V - (VCC_MAX - VOH_MAX))/RL] * (VCC_MAX - VOH_MAX) =[(2V - 0.9V)/50] * 0.9V = 19.8mWPd_L = [(VOL_MAX - (VCC_MAX -2V))/RL] * (VCC_MAX - VOL_MAX) = [(2V - (VCC_MAX - VOL_MAX))/RL] * (VCC_MAX - VOL_MAX) =[(2V - 1.7V)/50] * 1.7V = 10.2mWTotal Power Dissipation per output pair = Pd_H + Pd_L = 30mWVOUTVCCVCC - 2VQ1RL50Ω

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