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| 型号： | MPC5604PEF0MLQ6 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP144 |
| 封装： | 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-144 |
| 文件页数： | 63/99页 |
| 文件大小： | 1130K |
| 代理商： | MPC5604PEF0MLQ6 |
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MPC5604P Microcontroller Data Sheet, Rev. 7
Freescale Semiconductor
66
In fact a current sink contributor is represented by the charge sharing effects with the sampling capacitance: CS being
substantially a switched capacitance, with a frequency equal to the ADC conversion rate, it can be seen as a resistive path to
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 15. 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 15): 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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