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參數(shù)資料
| 型號(hào)： | ICS843-106 |
| 英文描述： | 106.25MHZ, LVCMOS, LVPECL DUAL OUTPUT OSCILLATOR |
| 中文描述： | 106.25MHZ，的LVCMOS，LVPECL的雙輸出振蕩器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 193K |
| 代理商： | ICS843-106 |
843AG-106
www.icst.com/products/hiperclocks.html
REV. A JANUARY 10, 2006
9
Integrated
Circuit
Systems, Inc.
ICS843-106
106.25MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
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.
T
o 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
– 0.9V
(V
CCO_MAX
- V
OH_MAX
) =
0.9V
For logic low, V
OUT
= V
OL_MAX
=
V
CC_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
– (V
- 2V))/R
[(2V - 0.9V)/50
Ω
] * 0.9V =
19.8mW
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
[(2V - 1.7V)/50
Ω
] * 1.7V =
10.2mW
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))/R
L
] * (V
CC_MAX
- V
OL_MAX
) =
Total Power Dissipation per output pair = Pd_H + Pd_L =
30mW
F
IGURE
3. LVPECL D
RIVER
C
IRCUIT
AND
T
ERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC
- 2V
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