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| 型号： | MPC5646CCF0CLU8R |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 80 MHz, MICROCONTROLLER, PQFP176 |
| 封装： | 24 X 24 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, LQFP-176 |
| 文件页数： | 87/115页 |
| 文件大小： | 783K |
| 代理商： | MPC5646CCF0CLU8R |
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Electrical Characteristics
MPC5646C Microcontroller Datasheet, Rev. 4
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
73
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 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 16. Input equivalent circuit (precise channels)
Figure 17. Input equivalent circuit (extended 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
RF
CF
RS
RL
RSW1
CP3
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
RSW Channel Selection Switch Impedance (two contributions RSW1 and RSW2)
RAD Sampling Switch Impedance
CP
Pin Capacitance (three contributions, CP1, CP2 and CP3)
CS
Sampling Capacitance
CP1
RAD
Channel
Selection
VA
CP2
Extended
RSW2
Switch
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC564AADPT176 | 功能描述:开发板和工具包 - 其他处理器 ANDORRA ADAPT RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MPC564AADPT208 | 制造商:Freescale Semiconductor 功能描述:ANDORRA ADAPSOLDERED |
| MPC564AKIT176 | 功能描述:开发板和工具包 - 其他处理器 ANDORRA 176QFP KIT RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MPC564AKIT176S | 制造商:Freescale Semiconductor 功能描述:MPC564XA 176 LQFP SOCKET EVAL KIT 制造商:Freescale Semiconductor 功能描述:MPC564XA, 176 LQFP SOCKET, EVAL KIT |
| MPC564AKIT208 | 制造商:Freescale Semiconductor 功能描述:ANDORRA 208BGA KIT |
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