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

Part No. 84330CI
Description  720MHz, Low Jitter, Crystal-to-LVPECL Frequency Synthesizer
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

84330CI Datasheet(HTML) 14 Page - Integrated Device Technology

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©2016 Integrated Device Technology, Inc
Revision A January 13, 2016
84330CI Data Sheet
3. 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 Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of
VCC - 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) = 1.7V
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 - (VCC_MAX -2V))/RL] * (VCC_MAX - VOH_MAX) = [(2V - (VCC_MAX - VOH_MAX))/RL] * (VCC_MAX - VOH_MAX) =
[(2V - 0.9V)/50
] * 0.9V = 19.8mW
Pd_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 = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
V
OUT
V
CC
V
CC - 2V
Q1
RL
50
Ω


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