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参数资料
| 型号： | MPC2510DTR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | PLL BASED CLOCK DRIVER, 10 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO24 |
| 封装： | TSSOP-24 |
| 文件页数： | 4/6页 |
| 文件大小： | 87K |
| 代理商： | MPC2510DTR2 |
MPC2510
MOTOROLA
ECLinPS and ECLinPS Lite
DL140 — Rev 3
4
Power Supply Filtering
The MPC2510 is a mixed analog/digital product and as
such it exhibits some sensitivities that would not necessarily
be seen on a fully digital product. Analog circuitry is naturally
susceptible to random noise, especially if this noise is seen
on the power supply pins. The MPC2510 provides separate
power supplies for the output buffers (VCCO) and the
phase–locked loop (VCCA) of the device. The purpose of this
design technique is to try and isolate the high switching noise
digital outputs from the relatively sensitive internal analog
phase–locked loop. In a controlled environment such as an
evaluation board this level of isolation is sufficient. However,
in a digital system environment where it is more difficult to
minimize noise on the power supplies a second level of
isolation may be required. The simplest form of isolation is a
power supply filter on the VCCA pin for the MPC2510.
Figure 3 illustrates a typical power supply filter scheme.
The MPC2510 is most susceptible to noise with spectral
content in the 1KHz to 10MHz range. Therefore the filter
should be designed to target this range. The key parameter
that needs to be met in the final filter design is the DC voltage
drop that will be seen between the VCC supply and the VCCA
pin of the MPC2510. From the data sheet the IVCCA current
(the current sourced through the VCCA pin) is typically 15mA
(20mA maximum), assuming that a minimum of 3.0V must be
maintained on the VCCA pin very little DC voltage drop can
be tolerated when a 3.3V VCC supply is used. The resistor
shown in Figure 3 must have a resistance of 10–15
to meet
the voltage drop criteria. The RC filter pictured will provide a
broadband filter with approximately 100:1 attenuation for
noise whose spectral content is above 20KHz. As the noise
frequency crosses the series resonant point of an individual
capacitor it’s overall impedance begins to look inductive and
thus increases with increasing frequency. The parallel
capacitor combination shown ensures that a low impedance
path to ground exists for frequencies well above the
bandwidth of the PLL. It is recommended that the user start
with an 8–10
resistor to avoid potential VCC drop problems
and only move to the higher value resistors when a higher
level of attenuation is shown to be needed.
Figure 3. Power Supply Filter
VCCA
VCC
MPC2510
0.01
F
22
F
0.01
F
3.3V
RS=5–15
Although the MPC2510 has several design features to
minimize the susceptibility to 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 schemes discussed in this section should be
adequate to eliminate power supply noise related problems
in most designs.
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相关代理商/技术参数 |
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| MPC2605ZP66 | 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:CACHE SUBSYSTEM, 241 Pin, Plastic, BGA |
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