參數(shù)資料
型號: ICS843034AY-01T
廠商: SPECTRUM CONTROL INC
元件分類: 時鐘產(chǎn)生/分配
英文描述: 640 MHz, OTHER CLOCK GENERATOR, PQFP48
封裝: 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBC, LQFP-48
文件頁數(shù): 11/22頁
文件大?。?/td> 292K
代理商: ICS843034AY-01T
843034AY-01
www.icst.com/products/hiperclocks.html
REV. C NOVEMBER 28, 2005
19
Integrated
Circuit
Systems, Inc.
ICS843034-01
FEMTOCLOCKS
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
Ω 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
Ω] * 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
Ω] * 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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