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SPC560D40L1 Datasheet(PDF) 64 Page - STMicroelectronics

No. de pieza SPC560D40L1
Descripción Electrónicos  32-bit MCU family built on the Power Architecture for automotive body electronics applications
PDF  90 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPC560D40L1 Datasheet(HTML) 64 Page - STMicroelectronics

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Electrical characteristics
SPC560D30x, SPC56040Dx
64/90
Doc ID 16315 Rev 7
Figure 13.
Input equivalent circuit (extended channels)
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 in Figure 13): A charge sharing phenomenon is installed when the
sampling phase is started (A/D switch close).
Figure 14.
Transient behavior during sampling phase
RF
CF
RS
RL
RSW1
CP3
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
CP2
Extended
RSW2
Switch
RS: Source impedance
RF: Filter resistance
CF: Filter capacitance
RL: Current limiter resistance
RSW1: Channel selection switch impedance (two contributions, RSW1 and RSW2)
RAD: Sampling switch impedance
CP: Pin capacitance (two contributions, CP1, CP2 and CP3)
CS: Sampling capacitance
VA
VA1
VA2
t
ts
VCS
Voltage transient on CS
V <0.5 LSB
1
2
1 < (RSW + RAD) CS << ts
2 = RL (CS + CP1 + CP2)



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