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    參數(shù)資料
    

    


    


    
型號(hào)：
MPC5604BF1CLL4

    

    
廠商：
FREESCALE SEMICONDUCTOR INC

    

    
元件分類：
微控制器/微處理器

    

    
英文描述：
MICROCONTROLLER, PQFP100

    

    
封裝：
14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, LQFP-100

    

    
文件頁(yè)數(shù)：
74/104頁(yè)

    

    
文件大小：
953K

    

    
代理商：
MPC5604BF1CLL4


    

    

    

	
    
    
    

    
    
	
    Electrical characteristics
    MPC5604B/C Microcontroller Data Sheet, Rev. 9
    Freescale Semiconductor
    71
    1. A first and quick charge transfer from the internal capacitance CP1 and CP2 to the sampling capacitance CS occurs (CS
    is supposed initially completely discharged): considering a worst case (since the time constant in reality would be
    faster) in which CP2 is reported in parallel to CP1 (call CP = CP1 + CP2), the two capacitances CP and CS are in series,
    and the time constant is
    Eqn. 5
    Equation 5 can again be simplified considering only CS as an additional worst condition. In reality, the transient is
    faster, but the A/D converter circuitry has been designed to be robust also in the very worst case: the sampling time ts
    is always much longer than the internal time constant:
    Eqn. 6
    The charge of CP1 and CP2 is redistributed also on CS, determining a new value of the voltage VA1 on the capacitance
    according to Equation 7:
    Eqn. 7
    2. A second charge transfer involves also CF (that is typically bigger than the on-chip capacitance) through the resistance
    RL: again considering the worst case in which CP2 and CS were in parallel to CP1 (since the time constant in reality
    would be faster), the time constant is:
    Eqn. 8
    In this case, the time constant depends on the external circuit: in particular imposing that the transient is completed
    well before the end of sampling time ts, a constraints on RL sizing is obtained:
    Eqn. 9
    Of course, RL shall be sized also according to the current limitation constraints, in combination with RS (source
    impedance) and RF (filter resistance). Being CF definitively bigger than CP1, CP2 and CS, then the final voltage VA2
    (at the end of the charge transfer transient) will be much higher than VA1. Equation 10 must be respected (charge
    balance assuming now CS already charged at VA1):
    Eqn. 10
    The two transients above are not influenced by the voltage source that, due to the presence of the RFCF filter, is not able to
    provide the extra charge to compensate the voltage drop on CS with respect to the ideal source VA; the time constant RFCF of
    the filter is very high with respect to the sampling time (ts). The filter is typically designed to act as anti-aliasing.
    1 RSW RAD
    +
    =
    CP CS
    CP CS
    +
    ---------------------
    1 RSW RAD
    +
    CS ts
    VA1 CS CP1 CP2
    ++
    VA CP1 CP2
    +
    =
    2 RL
    CS CP1 CP2
    ++
    10
    2
    10 RL CS CP1 CP2
    ++
    =
    ts
    VA2 CS CP1 CP2 CF
    ++
    +
    VA CF
    VA1
    +CP1 CP2
    +CS
    +
    =
    
    
    
    
    
    


    


    

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    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
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 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MPC5604B/C Microcontroller

    

    
    
    
    
	
    	
    
    
     
     
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