參數(shù)資料
型號(hào)： MPC5602F0MLL6R
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 64 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 14 X 14 MM, 1.40 MM, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-100
文件頁數(shù)： 54/95頁
文件大?。?/td> 1694K
代理商： MPC5602F0MLL6R
MPC5602P Microcontroller Data Sheet, Rev. 4.1
Freescale Semiconductor
58
ground. For instance, assuming a conversion rate of 1 MHz, with CS equal to 3 pF, a resistance of 330 k is obtained (REQ = 1
/ (fc × CS), where fc represents the conversion rate at the considered channel). To minimize the error induced by the voltage
partitioning between this resistance (sampled voltage on CS) and the sum of RS + RF + RL + RSW + RAD, the external circuit
must be designed to respect the Equation 4:
Eqn. 4
Equation 4 generates a constraint for external network design, in particular on resistive path. Internal switch resistances (RSW
and RAD) can be neglected with respect to external resistances.
Figure 14. Input equivalent circuit
A second aspect involving the capacitance network shall be considered. Assuming the three capacitances CF, CP1 and CP2 are
initially charged at the source voltage VA (refer to the equivalent circuit reported in Figure 14): A charge sharing phenomenon
is installed when the sampling phase is started (A/D switch closed).
VA
RS RF RL RSW RAD
++
+
REQ
---------------------------------------------------------------------------
1
2
---LSB
RF
CF
RS
RL
RSW1
CP2
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
RS: Source impedance
RF: Filter resistance
CF: Filter capacitance
RL: Current limiter resistance
RSW1: Channel selection switch impedance
RAD: Sampling switch impedance
CP: Pin capacitance (two contributions, CP1 and CP2)
CS: Sampling capacitance
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