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| 型號(hào)： | MPC5606SVLU6R |
| 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, MICROCONTROLLER, PQFP176 |
| 封裝： | 24 X 24 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, MS-026BGA, LQFP-176 |
| 文件頁(yè)數(shù)： | 131/136頁(yè) |
| 文件大?。?/td> | 858K |
| 代理商： | MPC5606SVLU6R |
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MPC5606S Microcontroller Data Sheet, Rev. 7
Freescale Semiconductor
94
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 conversion rate of the ADC, 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 7:
Eqn. 7
Equation 7 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 20. Input equivalent circuit (precise channels)
V
A
R
S
R
F
R
L
R
SW
R
AD
++
+
R
EQ
---------------------------------------------------------------------------
1
2
---LSB
RF
CF
RS
RL
RSW1
CP2
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
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
CP1
RAD
Channel
Selection
VA
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