參數(shù)資料
型號(hào)： ICS843034AYLF
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 時(shí)鐘產(chǎn)生/分配
英文描述： 750 MHz, OTHER CLOCK GENERATOR, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, MS-026BBC, LQFP-48
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 726K
代理商： ICS843034AYLF
IDT / ICS 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
15
ICS843034AY REV B JULY 18, 2006
ICS843034
FEMTOCOCKS MULTI-RATE 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
PRELIMINARY
Figure 5. CRYSTAL INPUt INTERFACE
CRYSTAL INPUT INTERFACE
The ICS843034 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 5 below were determined using a 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.
843034
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
LVCMOS TO XTAL INTERFACE
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in
Figure 6. The XTAL_OUT pin can be left floating. The
input edge rate can be as slow as 10ns. For LVCMOS inputs, it is
recommended that the amplitude be reduced from full swing to
half swing in order to prevent signal interference with the power
rail and to reduce noise. This configuration requires that the output
FIGURE 6. GENERAL DIAGRAM FOR LVCMOS DRIVER TO XTAL INPUT INTERFACE
impedance of the driver (Ro) plus the series resistance (Rs) equals
the transmission line impedance. In addition, matched termination
at the crystal input will attenuate the signal in half. This can be
done in one of two ways. First, R1 and R2 in parallel should equal
the transmission line impedance. For most 50
applications, R1
and R2 can be 100
. This can also be accomplished by removing
R1 and making R2 50
.
R2
Zo = 50
VDD
Ro
Zo = Ro + Rs
R1
VDD
XTAL_IN
XTAL_OUT
.1uf
Rs
相關(guān)PDF資料
PDF描述
ICS843081AGI-01T 700 MHz, OTHER CLOCK GENERATOR, PDSO8
ICS8430AY-51LF 600 MHz, OTHER CLOCK GENERATOR, PQFP32
ICS8430AYI-71LFT 700 MHz, OTHER CLOCK GENERATOR, PQFP32
ICS8430BY-71LF 700 MHz, OTHER CLOCK GENERATOR, PQFP32
ICS8430BYI-71 700 MHz, OTHER CLOCK GENERATOR, PQFP32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS843034AYLFT 功能描述:IC CLK SYNTHESIZER LVPECL 48LQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無(wú)/是 頻率 - 最大:800MHz 除法器/乘法器:是/無(wú) 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件
ICS843034AYT 制造商:ICS 制造商全稱:ICS 功能描述:MULTI-RATE 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
ICS843051 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
ICS8430-51 制造商:ICS 制造商全稱:ICS 功能描述:600MHZ, LOW JITTER LVCMOS/ LVTTL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
ICS843051AG 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
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