STM32L082KB datasheet(92/132 Pages) STMICROELECTRONICS

92 / 132 page

Electrical characteristics

STM32L082xx

92/132

DS10688 Rev 7

Equation 1: RAIN max formula

The simplified formula above (Equation 1) is used to determine the maximum external

impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

RAIN

fADC CADC

()

---------------------------------------------------------------- RADC

–

Table 62. RAIN max for fADC = 16 MHz(1)

(cycles)

(µs)

RAIN max for

fast channels

Ω)

RAIN max for standard channels (kΩ)

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 63. ADC accuracy(1)(2)(3)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Total unadjusted error

1.65 V < VDDA = VREF+ < 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

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