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參數(shù)資料
| 型號(hào)： | MPC9230 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 800 MHz Low Voltage PECL Clock Synthesizer |
| 中文描述： | 800 MHz低電壓PECL時(shí)鐘合成器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 296K |
| 代理商： | MPC9230 |
MPC9230
MOTOROLA
TIMING SOLUTIONS
power and grounds and fully differential PLL), there still may be
applications in which overall performance is being 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 application this level of
inaccuracy is immaterial.
Table 14
below specifies the
performance requirements of the crystals to be used with the
MPC9230.
1
C2
CF
XTAL
C1
C1
= V
CC
= 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
±
75ppm at 25
°
C
Frequency/Temperature Stability
±
150pm 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
μ
Aging
5ppm/Yr (First 3 Years)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPC9230AC | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 800MHz 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 |
| MPC9230ACR2 | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 800MHz 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 |
| MPC9230EI | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 800MHz 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 |
| MPC9230EIR2 | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 FSL 800MHz 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 |
| MPC9230FA | 功能描述:IC PECL CLOCK LV 800MHZ 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:* |
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