SPC58EEX datasheet(49/154 Pages) STMICROELECTRONICS

49 / 154 page

DS11646 Rev 4

49/154

SPC58EEx, SPC58NEx

Electrical characteristics

3.12

ADC system

3.12.1

ADC input description

Figure 8 shows the input equivalent circuit for SARn and SARB channels.

Figure 8. Input equivalent circuit (Fast SARn and SARB channels)

Specifications in the following table apply to both packaged parts and Known Good Die

(KGD) parts, except where noted.

All specifications in the following table valid for the full input voltage range for the analog

inputs.

RSW1

CP2

VDD

Sampling

INTERNAL CIRCUIT SCHEME

RSW1: Channel Selection Switch Impedance

RAD:

Sampling Switch Impedance

CP:

Pin Capacitance (two contributions, CP1 and CP2)

CS:

Sampling Capacitance

RCMSW: Common mode switch

RCMRL: Common mode resistive ladder

VCM:

Common mode voltage (~0.5 VDD)

CEXT: External capacitance

CP1

RAD

Channel

Selection

Common mode

switch

Common mode

resistive ladder

The above scheme can be used as approximation circuitry for external filtering definition.

VCM

RCMSW

RCMRL

CEXT

VSS_HV_ADR

Table 26. ADC pin specification

Symbol

Parameter

Conditions

Value

Unit

Min

Max

R20KΩ

CC D

Internal voltage reference source

impedance.

—16

ILKG

CC —

Input leakage current, two ADC

channels on input-only pin.

See IO chapter Table 11: I/O input electrical

characteristics, parameter ILKG.

IINJ1,2

SR —

Injection current on analog input

preserving functionality at full or

degraded performances.

See Operating Conditions chapter Table 5:

Operating conditions, IINJ1 and IINJ2 parameters.

CHV_ADC

SR D VDD_HV_ADV external capacitance.

See Power Management chapter Table 39: External

components integration, CADC parameter.

CP1

CC D Pad capacitance

See IO chapter Table 11: I/O input electrical

characteristics, parameter CP1.

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