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參數(shù)資料
| 型號(hào)： | MPC5602PEFMLQ |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, LQFP-144 |
| 文件頁(yè)數(shù)： | 36/72頁(yè) |
| 文件大?。?/td> | 661K |
| 代理商： | MPC5602PEFMLQ |
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MPC560xP Datasheet Data Sheet, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
41
Figure 7. 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 reported in Figure 6): A charge sharing phenomenon is
installed when the sampling phase is started (A/D switch close).
Figure 8. Transient Behavior during Sampling Phase
In particular two different transient periods can be distinguished:
A first and quick charge transfer from the internal capacitance CP1 and CP2 to the sampling capacitance CS occurs (CS
is supposed initially completely discharged): considering a worst case (since the time constant in reality would be
faster) in which CP2 is reported in parallel to CP1 (call CP = CP1 + CP2), the two capacitances CP and CS are in series,
and the time constant is
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
VA
VA1
VA2
t
TS
VCS
Voltage Transient on CS
ΔV < 0.5 LSB
1
2
τ
1 < (RSW + RAD) CS << TS
τ
2 = RL (CS + CP1 + CP2)
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