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MPC5644BCAMMJ1 데이터시트(PDF) 73 Page - NXP Semiconductors

부품명 MPC5644BCAMMJ1
상세설명  MPC5646C Microcontroller Datasheet
PDF  116 Pages
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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MPC5644BCAMMJ1 데이터시트(HTML) 73 Page - NXP Semiconductors

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Electrical Characteristics
MPC5646C Microcontroller DataSheet, Rev. 7
NXP Semiconductors
73
path to ground. For instance, assuming a conversion rate of 1MHz, with CS+Cp2 equal to 3pF, a resistance of 330KΩ is obtained
(Reqiv = 1 / (fc*(CS+Cp2)), 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+Cp2) and the sum of RS + RF, the external circuit
must be designed to respect the following relation
Eqn. 4
The formula above provides a constraint for external network design, in particular on resistive path.
Figure 16. Input equivalent circuit
VA
RS RF
+
REQ
---------------------
•
1
2
---LSB
<
RF
CF
RS
RL
RSW
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
RSW 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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