参数资料
型号: ICS8422002AGIT
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, PDSO20
封装: 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20
文件页数: 2/13页
文件大小: 315K
代理商: ICS8422002AGIT
8422002AGI
10
REV. B JANUARY 11, 2008
ICS8422002I
FEMTOCLOCKS CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
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 3.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
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
) * (2V - 1V) = 20mW
Pd_L = (0.4V/50
) * (2V - 0.4V) = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW
FIGURE 3. LVHSTL DRIVER CIRCUIT AND TERMINATION
V
DDO
V
OUT
RL
50
Q1
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