STM32F030R8 datasheet(65/88 Pages) STMICROELECTRONICS

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Electrical characteristics

Equation 1: RAIN max formula

The 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).

Table 49. RAIN max for fADC = 14 MHz

Ts (cycles)

tS (µs)

RAIN max (k)

(1)

1. Guaranteed by design, not tested in production.

1.5

0.11

0.4

7.5

0.54

5.9

13.5

0.96

11.4

28.5

2.04

25.2

41.5

2.96

37.2

55.5

3.96

71.5

5.11

239.5

17.1

Table 50. ADC accuracy(1)(2)(3)

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 IINJ(PIN) in

Section 6.3.14 does not affect the ADC accuracy.

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

Symbol

Parameter

Test conditions

Typ

Max(4)

4. Data based on characterization results, not tested in production.

Unit

Total unadjusted error

fPCLK = 48 MHz,

fADC = 14 MHz, RAIN < 10 k,

VDDA = 2.7 V to 3.6 V

TA = 40 to 85 °C

±3.3

±4

LSB

Offset error

±1.9

±2.8

Gain error

±2.8

±3

Differential linearity error

±0.7

±1.3

Integral linearity error

±1.2

±1.7

AIN

ADC





--------------------------------------------------------------

ADC

–



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