MPC9229AC Freescale Semiconductor, MPC9229AC Datasheet - Page 9

• Manufacturer Part Number: MPC9229AC
• Description: IC PECL CLOCK SYNTHESIZER 32LQFP
• Manufacturer: Freescale Semiconductor
• Type: Clock/Frequency Synthesizer, Clock Generatorr

Specifications of MPC9229AC

• Pll: Yes with Bypass
• Input: LVCMOS
• Output: LVCMOS, LVPECL
• Number Of Circuits: 1
• Ratio - Input:output: 1:1
• Differential - Input:output: Yes/Yes
• Frequency - Max: 400MHz
• Divider/multiplier: Yes/Yes
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Frequency-max: 400MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Using the On- -Board Crystal Oscillator
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
TIMING SOLUTIONS
The MPC9229 features a fully integrated on--board crystal
Figure 6. PCB Board Layout Recommendation for
Xtal
C
F
the PLCC28 Package
C2
C1
1
Freescale Semiconductor, Inc.
For More Information On This Product,
C1
= V
= GND
= Via
Go to: www.freescale.com
CC
9
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
1KΩ.
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.
* See accompanying text for series versus parallel resonant
Table 11. Recommended Crystal Specifications
Crystal Cut
Resonance
Frequency Tolerance
Frequency/Temperature Stability
Operating Range
Shunt Capacitance
Equivalent Series Resistance (ESR)
Correlation Drive Level
Aging
The oscillator circuit is a series resonant circuit and thus for
discussion.
Parameter
Fundamental AT Cut
Series Resonance*
±75ppm at 25°C
±150pm 0 to 70°C
0 to 70°C
5- -7pF
50 to 80Ω
100µW
5ppm/Yr (First 3 Years)
Value
MPC9229
MOTOROLA