- 您现在的位置：买卖IC网 > PDF目录132964 > MPC9299FN (MOTOROLA INC) 400 MHz, OTHER CLOCK GENERATOR, PQCC28 PDF资料下载
参数资料
| 型号： | MPC9299FN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 400 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 12/12页 |
| 文件大小： | 184K |
| 代理商： | MPC9299FN |
MPC9229
TIMING SOLUTIONS
9
MOTOROLA
power supply noise (isolated 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
C2
1
CF
Xtal
C1
=VCC
=GND
=Via
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
1K.
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.
Table 11. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±75ppm at 25°C
Frequency/Temperature Stability
±150pm 0 to 70°C
Operating Range
0to70°C
Shunt Capacitance
5--7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100W
Aging
5ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant
discussion.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T512Y-85PM1 | REAL TIME CLOCK, PDIP32 |
| MB89202YPFV | 8-BIT, MROM, 12.5 MHz, MICROCONTROLLER, PDSO34 |
| MPC7410THX450LE | 32-BIT, 450 MHz, RISC PROCESSOR, CBGA360 |
| M48T08Y-10MH1F | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| MK2703SILFTR | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC930 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:LOW VOLTAGE PLL CLOCK DRIVER |
| MPC930A43 F44A WAF | 制造商:Motorola Inc 功能描述: |
| MPC931 | 制造商:Motorola Inc 功能描述: |
| MPC9315 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:2.5V and 3.3V CMOS PLL Clock Generator and Driver |
| MPC9315AC | 功能描述:锁相环 - PLL 2.5 3.3V 160MHz Clock Generator RoHS:否 制造商:Silicon Labs 类型:PLL Clock Multiplier 电路数量:1 最大输入频率:710 MHz 最小输入频率:0.002 MHz 输出频率范围:0.002 MHz to 808 MHz 电源电压-最大:3.63 V 电源电压-最小:1.71 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:QFN-36 封装:Tray |
发布紧急采购，3分钟左右您将得到回复。