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| 型號： | IBM25PPC970MP7TR21AFT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 1600 MHz, RISC PROCESSOR, CBGA575 |
| 封裝： | 25 X 25 MM, 1 MM PITCH, CERAMIC, BGA-575 |
| 文件頁數(shù)： | 57/74頁 |
| 文件大?。?/td> | 845K |
| 代理商： | IBM25PPC970MP7TR21AFT |
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Datasheet
PowerPC 970MP RISC Microprocessor
System Design Information
Page 60 of 74
Version 1.3
January 17, 2008
5.3 PLL Power Supply Filtering
The PowerPC 970MP microprocessor has a separate pin, AVDD, that provides power to the clock generation
PLL.
To ensure stability of the internal clock, filter the AVDD power and ANALOG_GND supplied to the PLL using a
circuit similar to Figure 5-1. To ensure that the capacitor filters out as much noise as possible, the capacitor
should be placed as close as possible to the AVDD and ANALOG_GND pins. The capacitor used should have
minimal inductance. The ferrite bead shown in Figure 5-1 should supply an impedance of less than 70 Ω in
the 100 - 500 MHz region. It is recommended that the ferrite bead be placed within 1.5 cm, preferably closer,
to the AVDD pin.
The intent of all the recommendations it to provide a low noise voltage input to the PLL circuit. Place the filter
close to the pins. Close proximity of the filter to the pins, as well as It is also critical to avoid coupling to
nearby traces, both on the same plane and internal layers, especially after the filter is critical.
Note: AVDD measured at the pins of the part should never be more than 50 mV lower than the AVDD voltage
range specified in Table 3-3 Recommended Operating Conditions on page 24.
Figure 5-1. PLL Power Supply Filter Circuit
Discrete Resistor
2
Ω
Ferrite Bead
AVDD Power Supply Filter Circuit
C2
C1
AVDD Pin
Table 5-3. Filter Components
Item
Description/Value
Resistor
2
Ω
C1
0.1
μF X7F
C2
10.0
μF YV5
Ferrite Bead
Murata BLM21PG300SN1 or similar
Notes:
1. Connected to analog ground without a filter.
AVDD
Regulator
ANALOG_GND Pin1
AVDD
AVDD post filter (see previous note about AVDD.)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| IBM25PPC970MP7TR23AET | 制造商:IBM 功能描述:ANTARES MP DD1.1X 1.8GHZ PERFORMANCE OPTIMIZED - Trays |
| IBM25PPC970MP7TR30AET | 制造商:IBM Microelectronics 功能描述:ANTARES MP DD1.1X 2.0GHZ PERFORMANCE OPTIMIZED - Trays |
| IBM25PPC970MP7TR40AET | 制造商:IBM 功能描述:ANTARES MP DD1.1X 2.5GHZ PERFORMANCE OPTIMIZED - Trays |
| IBM25PPC970MP7TR50AET | 制造商:IBM 功能描述:ANTARES MP DD1.1X 1.2GHZ POWER OPTIMIZED - Trays |
| IBM25PPC970MP7TR60AET | 制造商:IBM 功能描述:ANTARES MP DD1.1X 1.4GHZ POWER OPTIMIZED - Trays |
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