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參數(shù)資料
| 型號： | MPC9230FN |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 750 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 795K |
| 代理商： | MPC9230FN |
MPC9230 REVISION 8 MARCH 29, 2010
11
2010 Integrated Device Technology, Inc.
MPC9230 Data Sheet
800MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
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 at 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
= 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MPC9239ACR2 | 功能描述:時鐘合成器/抖動清除器 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 |
| MPC9239EI | 功能描述:時鐘合成器/抖動清除器 FSL 900MHz 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 |
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