STM32F303VC datasheet(110/133 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F302xx/STM32F303xx

110/133

Doc ID 023353 Rev 5

Figure 32.

ADC accuracy characteristics

SINAD

Signal-to-

noise and

distortion ratio

ADC clock freq.

≤ 72 MHz,

Sampling freq.

≤ 5

Msps,

≤ VDDA , VREF+ ≤

3.6 V

Single Ended

Fast channel 5.1 Ms

Slow channel 4.8 Ms

Differential

Fast channel 5.1 Ms

Slow channel 4.8 Ms

SNR

Signal-to-

noise ratio

Single Ended

Fast channel 5.1 Ms

Slow channel 4.8 Ms

Differential

Fast channel 5.1 Ms

Slow channel 4.8 Ms

THD

Total

harmonic

distortion

Single Ended

Fast channel 5.1 Ms

−71

Slow channel 4.8 Ms

−69

Differential

Fast channel 5.1 Ms

−73

Slow channel 4.8 Ms

−70

ADC DC accuracy values are measured after internal calibration.

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.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.14 does not affect the ADC

accuracy.

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

Data based on characterization results, not tested in production.

Table 69.

ADC accuracy (1)(2)(3) (continued)

Symbol

Parameter

Conditions

Min (4)

Max(4)

Unit

1LSBIDEAL

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) End point correlation line

ET=Total Unadjusted Error: maximum deviation

between the actual and the ideal transfer curves.

EO=Offset Error: 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.

4095

4094

4093

456

4093 4094 4095 4096

(1)

(2)

(3)

VDDA

VSSA

ai14395b

VREF+

4096

(or

depending on package)]

VDDA

4096

[1LSBIDEAL =

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