參數(shù)資料
型號: ICS843004AGLF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 8/20頁
文件大?。?/td> 0K
描述: IC SYNTHESIZER LVPECL 24-TSSOP
標(biāo)準(zhǔn)包裝: 62
系列: HiPerClockS™, FemtoClock™
類型: 頻率合成器
PLL: 帶旁路
輸入: 晶體
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:4
差分 - 輸入:輸出: 無/是
頻率 - 最大: 226.66MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -30°C ~ 85°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
其它名稱: 800-1953-5
843004AGLF
ICS843004AGLF-ND
ICS843004
FEMTOCLOCKS LVCMOS/CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
16
ICS843004AG REV. C JANUARY 19, 2008
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 5.
Figure 5. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage
of VCCO – 2V.
For logic high, VOUT = VOH_MAX = VCCO_MAX – 0.9V
(VCCO_MAX – VOH_MAX) = 0.9V
For logic low, VOUT = VOL_MAX = VCOO_MAX – 1.7V
(VCCO_MAX – VOL_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 = [(VOH_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOH_MAX) = [(2V – (VCCO_MAX – VOH_MAX))/RL] * (VCCO_MAX – VOH_MAX) =
[(2V - 0.9V)/50
] * 0.9V = 19.8mW
Pd_L = [(VOL_MAX – (VCCO_MAX – 2V))/RL] * (VCCO_MAX – VOL_MAX) = [(2V – (VCCO_MAX – VOL_MAX))/RL] * (VCCO_MAX – VOL_MAX) =
[(2V – 1.7V)/50
] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
V
OUT
V
CCO
V
CCO - 2V
Q1
RL
50
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