SPC5604BF2MLL6 datasheet(73/109 Pages) FREESCALE

73 / 109 page

Package pinouts and signal descriptions

MPC5604B/C Microcontroller Data Sheet, Rev. 11

Freescale Semiconductor

Figure 21. 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 20): A charge sharing phenomenon is installed

when the sampling phase is started (A/D switch close).

Figure 22. Transient behavior during sampling phase

In particular two different transient periods can be distinguished:

RSW1

CP3

VDD

Sampling

Source

Filter

Current Limiter

EXTERNAL CIRCUIT

INTERNAL CIRCUIT SCHEME

CP1

RAD

Channel

Selection

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

VA1

VA2

VCS

Voltage transient on CS

V <0.5 LSB



1 < (RSW + RAD) CS << ts

2 = RL (CS + CP1 + CP2)

SPC5604BF2MLL6 数据表(PDF) 73 Page - Freescale Semiconductor, Inc

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