STM32L072KB datasheet(104/160 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L072xx

104/160

DS10689 Rev 5

Figure 30. 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 66. ADC accuracy(1)(2)(3) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ET = total unajusted 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 ones.

EL = integral linearity error: maximum deviation

between any actual transition and the end point

correlation line.

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) End point correlation line

4095

4094

4093

4093 4094 4095 4096

VDDA

VSSA

1 LSB IDEAL

(1)

(3)

(2)

MS19880V2

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