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参数资料
| 型号： | ICS84334AYT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, PQFP48 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026, LQFP-48 |
| 文件页数： | 10/21页 |
| 文件大小： | 335K |
| 代理商： | ICS84334AYT |
84334BY
www.icst.com/products/hiperclocks.html
REV. A JULY 22, 2004
18
Integrated
Circuit
Systems, Inc.
ICS84334
MULTI-RATE LVPECL FREQUENCY SYNTHESIZER
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 8.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
load, and a termination
voltage of V
CCO
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CCO_MAX
– 0.9V
(V
CCO_MAX
- V
OH_MAX
) = 0.9V
For logic low, V
OUT
= V
OL_MAX
= V
CCO_MAX
– 1.7V
(V
CCO_MAX
- V
OL_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 = [(V
OH_MAX
– (V
CCO_MAX
- 2V))/R
L
] * (V
CCO_MAX
- V
OH_MAX
) = [(2V - (V
CCO_MAX
- V
OH_MAX
))/R
L
] * (V
CCO_MAX
- V
OH_MAX
) =
[(2V - 0.9V)/50
] * 0.9V = 19.8mW
Pd_L = [(V
OL_MAX
– (V
CCO_MAX
- 2V))/R
L
] * (V
CCO_MAX
- V
OL_MAX
) = [(2V - (V
CCO_MAX
- V
OL_MAX
))/R
L
] * (V
CCO_MAX
- V
OL_MAX
) =
[(2V - 1.7V)/50
] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
FIGURE 8. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CCO
RL
50
V
CCO - 2V
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| ICS843404 | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AG | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AGLF | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
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