PPC5605BAMLU4R datasheet(78/114 Pages) NXP

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MPC5607B Microcontroller Data Sheet, Rev. 10

Electrical characteristics

NXP Semiconductors

Figure 18. 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 17): A charge sharing phenomenon is installed when the sampling phase is started (A/D switch

close).

Figure 19. Transient behavior during sampling phase

RSW1

CP3

VDD

Sampling

Source

Filter

Current Limiter

EXTERNAL CIRCUIT

INTERNAL CIRCUIT SCHEME

Source Impedance

Filter Resistance

Filter Capacitance

Current Limiter Resistance

RSW Channel Selection Switch Impedance (two contributions RSW1 and RSW2)

RAD Sampling Switch Impedance

Pin Capacitance (three contributions, CP1, CP2 and CP3)

Sampling Capacitance

CP1

RAD

Channel

Selection

CP2

Extended

RSW2

Switch

VA1

VA2

VCS

Voltage Transient on CS

ΔV < 0.5 LSB

τ1 < (RSW + RAD) CS << tS

τ2 = RL (CS + CP1 + CP2)

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