IDT / ICS HSTL FREQUENCY SYNTHESIZER
參數(shù)資料
型號(hào): SY88149HLMG TR
廠商: Micrel Inc
文件頁數(shù): 2/11頁
文件大?。?/td> 0K
描述: IC POST AMP BURST GEPON/GPON 16M
標(biāo)準(zhǔn)包裝: 1,000
類型: 限幅后置放大器
應(yīng)用: 光纖學(xué)網(wǎng)絡(luò)
安裝類型: 表面貼裝
封裝/外殼: 16-VFQFN 裸露焊盤,16-MLF?
供應(yīng)商設(shè)備封裝: 16-MLF?(3x3)
包裝: 帶卷 (TR)
IDT / ICS HSTL FREQUENCY SYNTHESIZER
10
ICS8421002AGI-01 REV B
MARCH 02, 2009
ICS8421002I-01
FEMTOCLOCKS CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER
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
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_MAX
/R
L
) * (V
DD_MAX
- V
OH_MAX
)
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. HSTL DRIVER CIRCUIT AND TERMINATION
V
DDO
V
OUT
RL
50
Q1
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