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    • 參數(shù)資料
      型號: MPC8545PXANGB
      廠商: FREESCALE SEMICONDUCTOR INC
      元件分類: 微控制器/微處理器
      英文描述: 32-BIT, 800 MHz, MICROPROCESSOR, PBGA783
      封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783
      文件頁數(shù): 33/142頁
      文件大?。?/td> 1504K
      代理商: MPC8545PXANGB
      MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
      128
      Freescale Semiconductor
      System Design Information
      21.2
      Power Supply Design
      21.2.1
      PLL Power Supply Filtering
      Each of the PLLs listed above is provided with power through independent power supply pins
      (AVDD_PLAT, AVDD_CORE, AVDD_PCI, AVDD_LBIU, and AVDD_SRDS, respectively). The AVDD
      level should always be equivalent to VDD, and preferably these voltages will be derived directly from VDD
      through a low frequency filter scheme such as the following.
      There are a number of ways to reliably provide power to the PLLs, but the recommended solution is to
      provide independent filter circuits per PLL power supply as illustrated in Figure 56, one to each of the
      AVDD pins. By providing independent filters to each PLL the opportunity to cause noise injection from
      one PLL to the other is reduced.
      This circuit is intended to filter noise in the PLLs resonant frequency range from a 500 kHz to 10 MHz
      range. It should be built with surface mount capacitors with minimum Effective Series Inductance (ESL).
      Consistent with the recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook
      of Black Magic (Prentice Hall, 1993), multiple small capacitors of equal value are recommended over a
      single large value capacitor.
      Each circuit should be placed as close as possible to the specific AVDD pin being supplied to minimize
      noise coupled from nearby circuits. It should be possible to route directly from the capacitors to the AVDD
      pin, which is on the periphery of the footprint, without the inductance of vias.
      Figure 56 through Figure 58 shows the PLL power supply filter circuits.
      Figure 56. PLL Power Supply Filter Circuit with PLAT Pins
      Figure 57. PLL Power Supply Filter Circuit with CORE Pins
      Figure 58. PLL Power Supply Filter Circuit with PCI/LBIU Pins
      VDD
      AVDD_PLAT
      2.2 F
      GND
      Low ESL Surface Mount Capacitors
      150
      Ω
      VDD
      AVDD_CORE
      2.2 F
      GND
      Low ESL Surface Mount Capacitors
      180
      Ω
      VDD
      AVDD_PCI/AVDD_LBIU
      2.2 F
      GND
      Low ESL Surface Mount Capacitors
      10
      Ω
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