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| 型号： | 873034AMLFT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 873034 SERIES, LOW SKEW CLOCK DRIVER, 3 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16 |
| 封装： | 7.50 X 10.30 MM, 2.30 MM HEIGHT, ROHS COMPLIANT, MS-012, SOIC-16 |
| 文件页数： | 5/16页 |
| 文件大小： | 298K |
| 代理商： | 873034AMLFT |
873034AM
13
REV. A JANUARY 17, 2008
ICS873034
LOW SKEW, ÷2, ÷4, ÷8 DIFFERENTIAL-TO-
2.5V, 3.3V LVPECL/ECL CLOCK GENERATOR
PRELIMINARY
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 7.
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
CC
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 1.005V
(V
CC_MAX
- V
OH_MAX
) = 1.005
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.78V
(V
CC_MAX
- V
OL_MAX
) = 1.78V
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
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
[(2V - 1.005V)/50
Ω] * 1.005V = 20mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))/R
L
] * (V
CC_MAX
- V
OL_MAX
) =
[(2V - 1.78V)/50
Ω] * 1.78V = 7.83mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 27.83mW
FIGURE 7. LVPECL DRIVER CIRCUIT AND TERMINATION
VOUT
Q1
VCC - 2V
RL
50
VCC
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|---|---|
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