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參數(shù)資料
| 型號(hào)： | MPC9229AC |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 400 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | LEAD FREE, LQFP-32 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 1359K |
| 代理商： | MPC9229AC |
MPC9229 REVISION 3 AUGUST 6, 2009
9
2009 Integrated Device Technology, Inc.
MPC9229 Data Sheet
400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
Figure 5. PCB Board Layout Recommendation
for the PLCC28 Package
Using the On-Board Crystal Oscillator
The MPC9229 features a fully integrated on-board crystal
oscillator to minimize system implementation costs. The oscillator is
a series resonant, multivibrator type design as opposed to the more
common parallel resonant oscillator design. The series resonant
design provides better stability and eliminates the need for large on
chip capacitors. The oscillator is totally self contained so that the
only external component required is the crystal. As the oscillator is
somewhat sensitive to loading on its inputs the user is advised to
mount the crystal as close to the MPC9229 as possible to avoid any
board level parasitics. To facilitate co-location surface mount
crystals are recommended, but not required. Because the series
resonant design is affected by capacitive loading on the XTAL
terminals loading variation introduced by crystals from different
vendors could be a potential issue. For crystals with a higher shunt
capacitance, it may be required to place a resistance across the
terminals to suppress the third harmonic. Although typically not
required, it is a good idea to layout the PCB with the provision of
adding this external resistor. The resistor value will typically be
between 500 and 1 K
.
The oscillator circuit is a series resonant circuit and thus for
optimum performance a series resonant crystal should be used.
Unfortunately most crystals are characterized in a parallel resonant
mode. Fortunately there is no physical difference between a series
resonant and a parallel resonant crystal. The difference is purely in
the way the devices are characterized. As a result a parallel
resonant crystal can be used with the MPC9229 with only a minor
error in the desired frequency. A parallel resonant mode crystal used
in a series resonant circuit will exhibit a frequency of oscillation a few
hundred ppm lower than specified, a few hundred ppm translates to
kHz inaccuracies. In a general computer application this level of
inaccuracy is immaterial. Table 11. below specifies the performance
requirements of the crystals to be used with the MPC9229.
1
C2
CF
XTAL
C1
R1 = 10–15
C1 = 0.01
F
C2 = 22
F
C3 = 0.01
F
= VCC
= GND
= Via
Table 11. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance(1)
1. Refer to the accompanying text for series versus parallel
resonant discussion.
Frequency Tolerance
±75 ppm at 25°C
Frequency/Temperature Stability
±150 pm 0 to 70°C
Operating Range
0 to 70
°C
Shunt Capacitance
5 – 7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
W
Aging
5 ppm/Yr (First 3 Years)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPC9229ACR2 | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 400MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MPC9229EI | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 400MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MPC9229EIR2 | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 400MHz LVPECL Freq. Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| MPC9229FA | 功能描述:IC PECL CLOCK LV 400MHZ 32-LQFP RoHS:否 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:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| MPC9229FAR2 | 制造商:Integrated Device Technology Inc 功能描述:PLL Clock Synthesizer Single 32-Pin TQFP T/R |
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