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SPC560P34L1 Datenblatt(PDF) 70 Page - STMicroelectronics

Teilenummer SPC560P34L1
Bauteilbeschribung  Programmable watchdog timer
PDF  103 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPC560P34L1 Datenblatt(HTML) 70 Page - STMicroelectronics

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Electrical characteristics
SPC560P34L1, SPC560P34L3, SPC560P40L1, SPC560P40L3
70/103
Doc ID 16100 Rev 7
Figure 16.
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 16): A charge sharing phenomenon is installed when
the sampling phase is started (A/D switch closed).
Figure 17.
Transient behavior during sampling phase
RF
CF
RS
RL
RSW
CP2
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
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
VA
VA1
VA2
t
TS
VCS
Voltage Transient on CS
ΔV < 0.5 LSB
1
2
τ1 < (RSW + RAD) CS << TS
τ2 = RL (CS + CP1 + CP2)



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