STM32L081CB datasheet(84/110 Pages) STMICROELECTRONICS

84 / 110 page

Electrical characteristics

STM32L081xx

84/110

DocID027513 Rev 4

Table 58. RAIN max for fADC = 16 MHz(1)

(cycles)

(µs)

RAIN max for

fast channels

)

RAIN max for standard channels (k)

VDD >

2.7 V

VDD >

2.4 V

VDD >

2.0 V

VDD >

1.8 V

VDD >

1.75 V

VDD > 1.65 V

and

TA > 10 °C

VDD > 1.65 V

and

TA > 25 °C

1.5

0.09

0.5

< 0.1

3.5

0.22

0.2

< 0.1

7.5

0.47

2.5

1.7

1.5

< 0.1

12.5

0.78

3.2

19.5

1.22

6.5

5.7

5.5

3.5

< 0.1

39.5

2.47

12.2

79.5

4.97

26.2

< 0.1

160.5

10.03

49.2

< 0.1

1. Guaranteed by design.

Table 59. ADC accuracy(1)(2)(3)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Total unadjusted error

1.65 V < VDDA < 3.6 V, range

1/2/3

-2

LSB

Offset error

2.5

Gain error

Integral linearity error

1.5

2.5

Differential linearity error

1.5

ENOB

Effective number of bits

10.2

bits

Effective number of bits (16-bit mode

oversampling with ratio =256)(4)

11.3

12.1

SINAD Signal-to-noise distortion

SNR

Signal-to-noise ratio

Signal-to-noise ratio (16-bit mode

oversampling with ratio =256)(4)

THD

Total harmonic distortion

-85

-73

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

2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) 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 standard analog pins which may potentially inject

negative current.



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

accuracy.

3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.

4. This number is obtained by the test board without additional noise, resulting in non-optimized value for oversampling mode.

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