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| 型号： | MPC9229EI |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 14/14页 |
| 文件大小： | 0K |
| 描述： | IC CLK SYNTH LV PECL 28-PLCC |
| 标准包装： | 37 |
| 类型： | 时钟/频率合成器 |
| PLL： | 带旁路 |
| 输入： | 晶体 |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 400MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-LCC（J 形引线） |
| 供应商设备封装： | 28-PLCC（11.5x11.5） |
| 包装： | 管件 |
MPC9229 REVISION 5 DECEMBER 19, 2012
9
2012 Integrated Device Technology, Inc.
MPC9229 Data Sheet
400MHZ LOW VOLTAGE PECL CLOCK SYNTHESIZER
Figure 5. PCB Board Layout Recommendation
for the PLCC28 Package
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 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 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.
1
C2
CF
XTAL
C1
R1 = 10–15
C1 = 0.01
F
C2 = 22
F
C3 = 0.01
F
= VCC
= GND
= Via
Table 11. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance(1)
1. Refer to the accompanying text for series versus parallel resonant
discussion.
Frequency Tolerance
75 ppm at 25C
Frequency/Temperature Stability
150 pm 0 to 70C
Operating Range
0 to 70
C
Shunt Capacitance
5 – 7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
W
Aging
5 ppm/Yr (First 3 Years)
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