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8537AY-01 PDF预览

8537AY-01

更新时间: 2024-01-10 09:18:29
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艾迪悌 - IDT /
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14页 121K
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8537AY-01 数据手册

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ICS8537-01  
HEX, LOW SKEW, 1-TO-2  
DIFFERENTIAL-TO-3.3V/2.5V LVPECL CLOCK BUFFER  
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 3.  
VCCO  
Q1  
VOUT  
R L  
50  
VCCO - 2V  
FIGURE 3. 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 ofV - 2V.  
CCO  
For logic high, VOUT = V  
= V  
– 0.9V  
OH_MAX  
CCO_MAX  
)
= 0.9V  
OH_MAX  
(V  
- V  
CCO_MAX  
For logic low, VOUT = V  
= V  
– 1.7V  
OL_MAX  
CC_MAX  
)
= 1.7V  
OL_MAX  
(V  
- V  
CC_MAX  
Pd_H is power dissipation when the output drives high.  
Pd_L is the power dissipation when the output drives low.  
))  
Pd_H = [(V  
– (V  
- 2V))/R ] * (V  
- V  
) = [(2V - (V  
- V  
/R ] * (V  
- V ) =  
OH_MAX  
OH_MAX  
CCO_MAX  
CCO_MAX  
OH_MAX  
CCO_MAX  
OH_MAX  
CCO_MAX  
L
L
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW  
))  
Pd_L = [(V  
– (V  
- 2V))/R ] * (V  
- V  
) = [(2V - (V  
- V  
/R ] * (V  
- V  
) =  
OL_MAX  
CCO_MAX  
CCO_MAX  
OL_MAX  
CCO_MAX  
OL_MAX  
CCO_MAX  
OL_MAX  
L
L
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW  
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW  
8537AY-01  
www.idt.com  
REV.B NOVEMBER 22, 2010  
9

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