FEMTOCLOCK
參數(shù)資料
型號: ICS843051AGLFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 16/17頁
文件大?。?/td> 0K
描述: IC CLOCK GENERATOR LVPECL 8TSSOP
標(biāo)準(zhǔn)包裝: 2,500
系列: HiPerClockS™, FemtoClock™
類型: 時(shí)鐘/頻率合成器,時(shí)鐘發(fā)生器
PLL:
輸入: 晶體
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 無/是
頻率 - 最大: 161.13MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 8-TSSOP
包裝: 帶卷 (TR)
其它名稱: 843051AGLFT
ICS843051AG REVISION A OCTOBER 13, 2010
8
2010 Integrated Device Technology, Inc.
ICS843051 Data Sheet
FEMTOCLOCK CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
Applications Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS843051 provides separate
power supplies to isolate any high switching noise from the outputs
to the internal PLL. VCC and VCCA should be individually connected
to the power supply plane through vias, and 0.01F bypass
capacitors should be used for each pin. Figure 1 illustrates this for a
generic VCC pin and also shows that VCCA requires that an additional
10
resistor along with a 10F bypass capacitor be connected to the
VCCA pin.
Figure 1. Power Supply Filtering
Crystal Input Interface
The ICS843051 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in Figure
2 below were determined using a 26.04167MHz, 18pF parallel
resonant crystal and were chosen to minimize the ppm error. The
optimum C1 and C2 values can be slightly adjusted for different
board layouts.
Figure 2. Crystal Input Interface
VCC
VCCA
3.3V
10
10F
.01F
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
33pF
C2
27pF
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