STM32F103V8H6TR Просмотр технического описания (PDF) - STMicroelectronics

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STM32F103V8H6TR

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

STMicroelectronics 

STM32F103xC, STM32F103xD, STM32F103xE

Electrical characteristics

Equation 1: RAIN max formula

RAIN



----------------------------T----S-----------------------------

fADC  CADC  ln 2N + 2

–

RADC

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 59. RAIN max for fADC = 14 MHz(1)

Ts (cycles)

tS (µs)

1.5

0.11

7.5

0.54

13.5

0.96

28.5

2.04

41.5

2.96

55.5

3.96

71.5

5.11

239.5

17.1

1. Guaranteed by design, not tested in production.

0.4

5.9

11.4

25.2

37.2

50

NA

NA

RAIN max (k)

Table 60.

Symbol

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

Parameter

Test conditions

Typ Max(3) Unit

ET Total unadjusted error

EO Offset error

EG Gain error

ED Differential linearity error

EL Integral linearity 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

VREF+ = VDDA

±1.3

±1

±0.5

±0.7

±0.8

±2

±1.5

±1.5

LSB

±1

±1.5

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 5.3.13 does not

affect the ADC accuracy.

3. Based on characterization, not tested in production.

Doc ID 14611 Rev 7

99/123

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