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| 型号： | ICS843246I |
| 厂商： | Integrated Device Technology, Inc. |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| 中文描述： | FEMTOCLOCKS⑩晶体至3.3的LVPECL频率合成瓦/扇出缓冲器集成 |
| 文件页数： | 13/17页 |
| 文件大小： | 345K |
| 代理商： | ICS843246I |
IDT
/ ICS
3.3V LVPECL FREQUENCY SYNTHESIZER
13
ICS843246BGI REV. A AUGUST 2, 2007
ICS843246I
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT 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 7.
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
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
F
IGURE
7. LVPECL D
RIVER
C
IRCUIT
AND
T
ERMINATION
Q1
V
OUT
V
CCO
RL
50
V
CCO
- 2V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS84324EM | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84324EMT | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84325 | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS8432-51 | 制造商:ICS 制造商全称:ICS 功能描述:700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| ICS843251-04 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR |
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