STM32F103RBT7TR datasheet(72/96 Pages) STMICROELECTRONICS

Part #	STM32F103RBT7TR

Description	Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces

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Electrical characteristics

STM32F103x8, STM32F103xB

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Doc ID 13587 Rev 12

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 46.

RAIN max for fADC = 14 MHz

(1)

1.

Based on characterization, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (k)

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

50

71.5

5.11

NA

239.5

17.1

NA

Table 47.

ADC accuracy - limited test conditions(1) (2)

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 5.3.12 does not

affect the ADC accuracy.

Symbol

Parameter

Test conditions

Typ

Max(3)

3.

Based on characterization, not tested in production.

Unit

ET

Total unadjusted error

fPCLK2 = 56 MHz,

fADC = 14 MHz, RAIN < 10 k,

VDDA = 3 V to 3.6 V

TA = 25 °C

Measurements made after

ADC calibration

±1.3

±2

LSB

EO

Offset error

±1

±1.5

EG

Gain error

±0.5

±1.5

ED

Differential linearity error

±0.7

±1

EL

Integral linearity error

±0.8

±1.5

R

AIN

T

S

f

ADC

C

ADC

2

N2

+



ln



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

R

ADC

–



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