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| 型号： | MPC5604PEFMLQ4R |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 40 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： | 36/72页 |
| 文件大小： | 1382K |
| 代理商： | MPC5604PEFMLQ4R |
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MPC5604P Microcontroller Data Sheet, Rev. 4
Freescale Semiconductor
41
be measured. The filter at the input pins must be designed taking into account the dynamic characteristics of the input signal
(bandwidth) and the equivalent input impedance of the ADC itself.
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 kΩ 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 6. 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 6): A charge sharing phenomenon is
installed when the sampling phase is started (A/D switch close).
VA
RS RF RL RSW RAD
++
+
REQ
---------------------------------------------------------------------------
1
2
---LSB
<
RF
CF
RS
RL
RSW1
CP2
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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| MPC5604PFF0MLL7R | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:microcontroller units (MCUs) |
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