STM32G474PBY6XXX datasheet(150/236 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32G474xB STM32G474xC STM32G474xE

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DS12288 Rev 5

Table 71. ADC accuracy (Multiple ADCs operation) - limited test conditions 1(1)(2)(3)

Symbol

Parameter

Conditions(4)

Min

Typ

Max

Unit

Total unadjusted

error

Multiple ADC operation

ADC clock frequency:

single ended ≤ 52 MHz,

differential ≤ 56 MHz,

VDDA = VREF= 3.3 V,

25°C,

Continuous mode,

sampling time:

Fast channels: 2.5 cycles

Slow channels: 6.5 cycles

LQFP100 package

Single ended

4.5

LSB

Differential

4.1

Offset error

Single ended

1.3

Differential

0.4

Gain error

Single ended

3.9

Differential

3.4

Differential

linearity error

Single ended

1.5

Differential

1.2

Integral linearity

error

Single ended

1.7

Differential

2.1

ENOB

Effective

number of bits

Single ended

10.7

bits

Differential

10.9

SINAD

Signal-to-noise

and distortion

ratio

Single ended

66.3

Differential

67.2

SNR

Signal-to-noise

ratio

Single ended

67.3

Differential

68.6

THD

Total harmonic

distortion

Single ended

-73.5

Differential

-73

1. Data based on characterization result, not tested in production.

2. ADC DC accuracy values are measured after internal calibration.

3. ADC accuracy vs. negative Injection Current: Injecting negative current on any analog input pins should be avoided

as this significantly reduces the accuracy of the conversion being performed on another analog input. It is

recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject negative current.

4. The I/O analog switch voltage booster is enabled when VDDA < 2.4 V (BOOSTEN = 1 in the SYSCFG_CFGR1 when

VDDA < 2.4 V). It is disabled when VDDA ≥ 2.4 V. No oversampling.

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