STM32L082KB datasheet(93/132 Pages) STMICROELECTRONICS

93 / 132 page

DS10688 Rev 7

93/132

STM32L082xx

Electrical characteristics

109

Figure 25. ADC accuracy characteristics

Total unadjusted error

1.65 V < VREF+ <VDDA < 3.6 V,

range 1/2/3

-2

LSB

Offset error

2.5

Gain error

Integral linearity error

1.5

Differential linearity error

ENOB

Effective number of bits

10.0

11.0

bits

SINAD Signal-to-noise distortion

SNR

Signal-to-noise ratio

THD

Total harmonic distortion

-85

-65

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 ΣIINJ(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.

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

MSv19880V6

(1) Example of an actual transfer curve

(2) Ideal transfer curve

(3) End-point correlation line

n = ADC resolution

ET = total unadjusted error: maximum deviation

between the actual and ideal transfer curves

EO = offset error: maximum deviation between the first

actual transition and the first ideal one

EG = gain error: deviation between the last ideal

transition and the last actual one

ED = differential linearity error: maximum deviation

between actual steps and the ideal one

EL = integral linearity error: maximum deviation between

any actual transition and the end point correlation line

n-1

Output code

VSSA

n-2

n-3

VREF+ (VDDA)

1 LSB ideal

(1)

(2)

(3)

(or

)]

[1LSB =

VDDA

VREF+

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