STM32L412R8U3XXX datasheet(149/192 Pages) STMICROELECTRONICS

149 / 192 page

DS12469 Rev 8

149/192

STM32L412xx

Electrical characteristics

164

Figure 31. ADC accuracy characteristics

THD

Total

harmonic

distortion

ADC clock frequency ≤

26 MHz,

1.65 V ≤ VDDA = VREF+ ≤

3.6 V,

Voltage scaling Range 2

Single

ended

Fast channel (max speed)

-71

-69

Slow channel (max speed)

-71

-69

Differential

Fast channel (max speed)

-73

-72

Slow channel (max speed)

-73

-72

1. Guaranteed by design.

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

3. ADC accuracy vs. negative Injection Current: Injecting negative current on any 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 analog pins which may potentially inject negative current.

4. The I/O analog switch voltage booster is enable when VDDA < 2.4 V (BOOSTEN = 1 in the SYSCFG_CFGR1 when

VDDA < 2.4 V). It is disable when VDDA ≥ 2.4 V. No oversampling.

Table 80. ADC accuracy - limited test conditions 4(1)(2)(3) (continued)

Sym-

bol

Parameter

Conditions(4)

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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