SPC56EL54X datasheet(121/165 Pages) STMICROELECTRONICS

Il numero della parte	SPC56EL54x

Spiegazioni elettronici	Dual issue five-stage pipeline core

PDF	165 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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DocID15457 Rev 12

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SPC56ELx, SPC564Lx

Electrical characteristics

164

Equation 4:

Equation 4

generates a constraint for external network design, in particular on resistive path.

Internal switch resistances (RSW and RAD) can be neglected with respect to external

resistances.

Figure 10. 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 10): A charge sharing phenomenon is installed when

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

---------------------



---LSB



RSW1

CP2

VREF

Sampling

Source

Filter

Current Limiter

EXTERNAL CIRCUIT

INTERNAL CIRCUIT SCHEME

Legend:

RS Source Impedance

Filter Resistance

Filter Capacitance

Current Limiter Resistance

RSW1 Channel Selection Switch Impedance

RAD Sampling Switch Impedance

Pin Capacitance (two contributions, CP1 and CP2)

Sampling Capacitance

CP1

RAD

Channel

Selection

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