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參數(shù)資料
| 型號： | MPC9230EIR2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 750 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封裝： | LEAD FREE, PLASTIC, LCC-28 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 375K |
| 代理商： | MPC9230EIR2 |
Advanced Clock Drivers Devices
Freescale Semiconductor
11
MPC9230
degraded due to system power supply noise. The power
supply filter and bypass schemes discussed in this section
should be adequate to eliminate power supply noise related
problems in most designs.
Figure 6. PCB Board Layout Recommendation for
the PLCC28 Package
Using the On-Board Crystal Oscillator
The MPC9230 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 MPC9230 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 MPC9230 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
below specifies the performance requirements of the crystals
to be used with the MPC9230.
1
C2
CF
XTAL
C1
= VCC
= GND
= Via
Table 14. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance(1)
1. See 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
5–7 pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
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 |
|---|---|
| MPC9230FA | 功能描述:IC PECL CLOCK LV 800MHZ 32-LQFP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 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:* 供應商設備封裝:* 包裝:* |
| MPC9230FN | 功能描述:鎖相環(huán) - PLL 3.3V 800MHz Clock Generator RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| MPC9230FNR2 | 制造商:Integrated Device Technology Inc 功能描述:PLL Clock Synthesizer Single 28-Pin PLCC T/R 制造商:Integrated Device Technology Inc 功能描述:FSL 800MHz LVPECL Freq. Synthesizer |
| MPC9239 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:900 MHz Low Voltage LVPECL Clock Synthesizer |
| MPC9239AC | 功能描述:時鐘合成器/抖動清除器 2.5 3.3V 250MHz Clock Generator 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 |
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