SPC572L60F2 datasheet(45/112 Pages) STMICROELECTRONICS

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SPC572Lx

Electrical characteristics

111

Figure 13. Input equivalent circuit (SARB channels)

RSW1

CP3

VDD

Sampling

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

RCMSW: Common mode switch

RCML: Common mode resistive ladder

The above figure can be used as approximation circuitry for

external filtering definition.

It is applicable for all SARB channels except AN 16, AN17 and

AN24 (Fast channels).

CP1

RAD

Channel

Selection

CP2

Extended

RSW2

Switch

Common mode

switch

Common mode

resistive ladder

INTERNAL CIRCUIT SCHEME

Table 24. ADC pin specification(1)

Symbol

Parameter

Conditions

Value

Unit

Min

Max

ILK_INUD

Input leakage current, two ADC

channels input with weak pull-up and

weak pull-down

TJ <40 °C, no current

injection on adjacent

—70

CTJ < 150 °C, no current

injection on adjacent

—220

ILK_INUSD

Input leakage current, two ADC

channels input with weak pull-up and

strong pull-down

TJ <40 °C, no current

injection on adjacent

—80

CTJ < 150 °C, no current

injection on adjacent

—250

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