SPC572LX datasheet(46/112 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC572Lx

46/112

DocID027866 Rev 5

3.12.2

SAR ADC electrical specification

The SARn ADCs are 12-bit Successive Approximation Register analog-to-digital converters

with full capacitive DAC. The SARn architecture allows input channel multiplexing.

ILK_INREF

Input leakage current, two ADC

channels input with weak pull-up and

weak pull-down and alternate reference

TJ< 40 °C, no current

injection on adjacent

—160

CTJ < 150 °C, no current

injection on adjacent

—400

ILK_INOUT

Input leakage current, two ADC

channels input, GPIO output buffer with

weak pull-up and weak pull-down

TJ <40 °C, no current

injection on adjacent

—140

CTJ < 150 °C, no current

injection on adjacent

—380

IINJ

Injection current on analog input

preserving functionality

Applies to any analog

pins

–3

CHV_ADC

VDD_HV_ADV external capacitance(2)

12.2

µF

CP1

Pad capacitance

—

CP2

Internal routing capacitance

SARn channels

0.5

SARB channels(3)

CP3

Internal routing capacitance

Only for SARB

channels

SAR ADC sampling capacitance

—

8.5

RSWn

Analog switches resistance

SARn channels

1.1

SARB channels(4)

01.7

RAD

ADC input analog switches resistance

—

0.6

RCMSW

Common mode switch resistance

—

2.6

RCMRL

Common mode resistive ladder

—

3.5

RSAFEPD(4)

Discharge resistance for AN7 channels

(strong pull-down for safety)

—0

300

ΣIADR

CC C+

Sum of ADC and S/D reference

consumption

ADC enabled

—

µA

1. All specifications in this table valid for the full input voltage range for the analog inputs.

2. For noise filtering, add a high frequency bypass capacitance of 0.1 µF between VDD_HV_ADV and VSS_HV_ADV.

3. Characteristics corresponding to fast SARn channels also apply to SARB fast channels (AN16, AN17 and AN24).

4. Safety pull-down is available for port pin PE[14]. It enables discharge of up to 100 nF from 5 V every 300 ms.

Table 24. ADC pin specification(1) (continued)

Symbol

Parameter

Conditions

Value

Unit

Min

Max

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