IDT / ICS 3.3V, 2.5V LVPECL TRANSLATOR
參數(shù)資料
型號: SY54020RMG TR
廠商: Micrel Inc
文件頁數(shù): 3/14頁
文件大?。?/td> 0K
描述: IC CLK BUFFER 1:4 2.5GHZ 16-MLF
產(chǎn)品培訓模塊: High Bandwidth Product Overview
標準包裝: 1,000
系列: Precision Edge®
類型: 扇出緩沖器(分配)
電路數(shù): 1
比率 - 輸入:輸出: 1:4
差分 - 輸入:輸出: 是/是
輸入: CML,LVDS,LVPECL
輸出: CML
頻率 - 最大: 2.5GHz
電源電壓: 2.375 V ~ 2.625 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VFQFN 裸露焊盤,16-MLF?
供應商設備封裝: 16-MLF?(3x3)
包裝: 帶卷 (TR)
IDT / ICS 3.3V, 2.5V LVPECL TRANSLATOR
11
ICS8532AMI REV A NOVEMBER 13, 2006
ICS85320I
LVCMOS/LVTTL-TO-DIFFERENTIAL 3.3V, 2.5V LVPECL TRANSLATOR
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 4.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
load, and a termination
voltage of V
CC
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 1.0V
(V
CC_MAX
- V
OH_MAX
) = 1.0V
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.7V
(V
CC_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
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
[(2V - 1V)/50
] * 1V = 20.0mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))/R
L
] * (V
CC_MAX
- V
OL_MAX
) =
[(2V - 1.7V)/50
] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V
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