参数资料
型号: ICS8422004AGI
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 时钟产生/分配
英文描述: 226.66 MHz, OTHER CLOCK GENERATOR, PDSO24
封装: 4.40 X 7.80 MM, 0.92 MM HEIGHT, MO-153, TSSOP-24
文件页数: 2/14页
文件大小: 411K
代理商: ICS8422004AGI
8422004AGI
www.icst.com/products/hiperclocks.html
REV. B NOVEMBER 14, 2005
10
Integrated
Circuit
Systems, Inc.
ICS8422004I
FEMTOCLOCKSLVCMOS/CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
HSTL output driver circuit and termination are shown in Figure 3.
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 3. HSTL DRIVER CIRCUIT AND TERMINATION
V
DDO
V
OUT
RL
50
Ω
Q1
ICS8422004I
FEMTOCLOCKS LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
TSD
IDT / ICS FEMTOCLOCKS LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
ICS8422004I
10
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