- 您现在的位置：买卖IC网 > PDF目录53816 > MPC92430FA (FREESCALE SEMICONDUCTOR INC) 800 MHz, OTHER CLOCK GENERATOR, PQFP32 PDF资料下载
参数资料
| 型号： | MPC92430FA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封装： | LQFP-32 |
| 文件页数： | 9/9页 |
| 文件大小： | 165K |
| 代理商： | MPC92430FA |
MPC92430
426
FREESCALE SEMICONDUCTOR ADVANCED CLOCK DRIVERS DEVICE DATA
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 MPC92430 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 MPC92430 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
MPC92430 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 12 below specifies the
performance requirements of the crystals to be used with the
MPC92430.
1
C2
CF
XTAL
C1
= VCC
= GND
= Via
Table 12. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance1
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
W
Aging
5ppm/Yr (First 3 Years)
相关PDF资料 |
PDF描述 |
|---|---|
| MPC9330FAR2 | 120 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| MPC9330FA | 120 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| MPC9817SD | 66 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20 |
| MPC9817EN | 66 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO20 |
| MPC9850VM | 500 MHz, PROC SPECIFIC CLOCK GENERATOR, PBGA100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC92432 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:1360 MHz Dual Output LVPECL Clock Synthesizer |
| MPC92432AE | 功能描述:时钟合成器/抖动清除器 FSL 1360MHz Dual Out put LVPECL Clock Syn RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC92432AER2 | 功能描述:时钟合成器/抖动清除器 FSL 1360MHz Dual Out put LVPECL Clock Syn RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| MPC92432FA | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:1360 MHz Dual Output LVPECL Clock Synthesizer |
| MPC92433 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:1428 MHz Dual Output LVPECL Clock Synthesizer |
发布紧急采购，3分钟左右您将得到回复。