参数资料
型号: ICS8427BK-02T
元件分类: 时钟产生/分配
英文描述: 700 MHz, OTHER CLOCK GENERATOR, QCC32
封装: 5 X 5 MM, 0.75 MM HEIGHT, MO-220, VFQFN-32
文件页数: 7/19页
文件大小: 280K
代理商: ICS8427BK-02T
8427BY-02
www.icst.com/products/hiperclocks.html
REV. A MARCH 4, 2005
15
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS8427-02
700MHZ, LOW JITTER
LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVHSTL 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.
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_MIN
/R
L
) * (V
DD_MAX
- V
OH_MIN
)
Pd_L = (V
OL_MAX
/R
L
) * (V
DD_MAX
- V
OL_MAX
)
Pd_H = (1V/50
Ω) * (2V - 1V) = 20mW
Pd_L = (0.4V/50
Ω) * (2V - 0.4V) = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW
FIGURE 7. LVHSTL DRIVER CIRCUIT AND TERMINATION
V
DDO
V
OUT
RL
50
Ω
Q1
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