STM32L151XE datasheet(105/136 Pages) STMICROELECTRONICS

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DS10002 Rev 10

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STM32L151xE STM32L152xE

Electrical characteristics

114

Table 56. ADC accuracy(1)(2)

Symbol

Parameter

Test conditions

Min(3)

Typ

Max(3) Unit

Total unadjusted error

2.4 V

≤ VDDA ≤ 3.6 V

2.4 V

≤ VREF+ ≤ 3.6 V

fADC = 8 MHz, RAIN = 50 Ω

TA = -40 to 105 °C

-2.5

LSB

Offset error

Gain error

1.5

3.5

Differential linearity error

Integral linearity error

2.2

ENOB

Effective number of bits

2.4 V

≤ VDDA ≤ 3.6 V

VDDA = VREF+

fADC = 16 MHz, RAIN = 50 Ω

TA = -40 to 105 °C

Finput=10kHz

9.2

bits

SINAD

Signal-to-noise and

distortion ratio

57.5

SNR

Signal-to-noise ratio

57.5

THD

Total harmonic distortion

-70

-65

ENOB

Effective number of bits

1.8 V

≤ VDDA ≤ 2.4 V

VDDA = VREF+

fADC = 8 MHz or 4 MHz, RAIN = 50 Ω

TA = -40 to 105 °C

Finput=10kHz

9.2

bits

SINAD

Signal-to-noise and

distortion ratio

57.5

SNR

Signal-to-noise ratio

57.5

THD

Total harmonic distortion

-70

-65

Total unadjusted error

2.4 V

≤ VDDA ≤ 3.6 V

1.8 V

≤ VREF+ ≤ 2.4 V

fADC = 4 MHz, RAIN = 50 Ω

TA = -40 to 105 °C

-4

6.5

LSB

Offset error

1.5

Gain error

3.5

Differential linearity error

Integral linearity error

2.5

Total unadjusted error

1.8 V

≤ VDDA ≤ 2.4 V

1.8 V

≤ VREF+ ≤ 2.4 V

fADC = 4 MHz, RAIN = 50 Ω

TA = -40 to 105 °C

-2

LSB

Offset error

1.5

Gain error

1.5

Differential linearity error

Integral linearity error

2.2

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

2. ADC accuracy vs. negative injection current: Injecting a negative current on any analog input pins must 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 currents.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.12 does not affect the ADC

accuracy.

3. Guaranteed by characterization results.

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