ICS8741004 datasheet(14/17 Pages) IDT

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ICS8741004

DIFFERENTIAL-TO-LVDS/0.7V DIFFERENTIAL PCI EXPRESS™ JITTER ATTENUATOR

IDT™ / ICS™ PCI EXPRESS™ JITTER ATTENUATOR

ICS8741004AG REV. AAUGUST 3, 2007

3. Calculations and Equations.

The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.

HCSL output driver circuit and termination are shown in Figure 6.

Figure 6. LVHSTL 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.

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 /RL) * (VDD_MAX – VOH_MAX)

Pd_L = (VOL_MIN /RL) * (VDD_MAX – VOL_MIN)

Pd_H = (0.85V/50

Ω) * (3.465V – 0.87V) = 44.1mW

Pd_L = (0.15V/50

Ω) * 0.15V = 0.45mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 45mW

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