IDT / ICS 3.3V LVPECL CLOCK GENERATOR
參數(shù)資料
型號(hào): CS5351-KZZ
廠商: Cirrus Logic Inc
文件頁(yè)數(shù): 3/16頁(yè)
文件大?。?/td> 0K
描述: IC ADC AUD 108DB 204KHZ 24-TSSOP
標(biāo)準(zhǔn)包裝: 62
位數(shù): 24
采樣率(每秒): 204k
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 243mW
電壓電源: 模擬和數(shù)字
工作溫度: -10°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 24-TSSOP
包裝: 管件
輸入數(shù)目和類型: 2 個(gè)單端,單極
產(chǎn)品目錄頁(yè)面: 755 (CN2011-ZH PDF)
配用: 598-1781-ND - EVALUATION BOARD FOR CS5351
其它名稱: 598-1085-5
IDT / ICS 3.3V LVPECL CLOCK GENERATOR
11
ICS843001AG REV B March 2, 2009
ICS843001
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
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
– 0.9V
(V
CCO_MAX
- V
OH_MAX
) = 0.9V
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.7V
(V
CCO_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 - 0.9V)/50
] * 0.9V = 19.8mW
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 = 30mW
FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V
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