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| 型號： | ICS843031AG-01LF |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK GENERATOR LVPECL 8-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 96 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 類型： | 時鐘/頻率合成器，時鐘發(fā)生器 |
| PLL： | 是 |
| 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： | 340MHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.375 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： | 管件 |
| 其它名稱： | 843031AG-01LF |
IDT / ICS 3.3V, 2.5V LVPECL CLOCK GENERATOR
7
ICS843031AG-01 REV. A NOVEMBER 11, 2008
ICS843031-01
FEMTOCLOCKS CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
APPLICATION INFORMATION
FIGURE 2. CRYSTAL INPUt INTERFACE
CRYSTAL INPUT INTERFACE
The ICS843031-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 2 below were determined using a 25MHz, 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.
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
POWER SUPPLY FILTERING TECHNIQUES
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. To achieve optimum jitter per-
formance, power supply isolation is required. The ICS843031-01
provides separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC 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 V
CC pin and also shows
that V
CCA requires that an additional10Ω resistor along with a
10F bypass capacitor be connected to the V
CCA pin.
FIGURE 1. POWER SUPPLY FILTERING
10
Ω
V
CCA
10
μF
.01
μF
3.3V or 2.5V
.01
μF
V
CC
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