STM32F103VB データシートの表示（PDF） - STMicroelectronics

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STM32F103VB

Performance line, ARM-based 32-bit MCU with Flash, USB, CAN, seven 16-bit timers, two ADCs and nine communication interfaces

STMicroelectronics 

STM32F103xx

Electrical characteristics

Table 39. ADC characteristics(1) (continued)

Symbol

Parameter

Conditions

Min Typ Max Unit

RAIN

CAIN

External input impedance

External capacitor on analog

input

kΩ

TBD(2)(3)

pF

Ilkg

Negative input leakage current VIN < VSS, | IIN | < 400 µA

on analog pins

on adjacent analog pin

5

6

µA

RADC

CADC

Sampling switch resistance

Internal sample and hold

capacitor

tCAL Calibration time

tlat Injection conversion latency

tS

tSTAB

Sampling time

Power-up time

tCONV

Total conversion time (including

sampling time)

fADC = 14MHz

fADC = 14 MHz

fADC = 14 MHz

fADC = 14 MHz

1

kΩ

5

pF

0.107

5.9

83

0.214

3

17.1

µs

1/fADC

µs

1/fADC

µs

00 1

µs

1

18

14 (1.5 for sampling

+12.5 for successive

approximation)

µs

1/fADC

1. TBD = to be determined.

2. Depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and reduced to

allow the use of a larger serial resistor (RAIN). It is valid for all fADC frequencies ≤14 MHz.

3. During the sample time the input capacitance CAIN (5 max) can be charged/discharged by the external

source. The internal resistance of the analog source must allow the capacitance to reach its final voltage

level within tS. After the end of the sample time tS, changes of the analog input voltage have no effect on

the conversion result. Values for the sample clock tS depend on programming.

Table 40. ADC accuracy (fPCLK2 = 14 MHz, fADC = 14 MHz, RAIN <10 kΩ, VDDA =

3.3 V)(1)

Symbol

Parameter

Conditions

Typ

Max Unit

|ET| Total unadjusted error(2)

|EO| Offset error(2)

|EG| Gain Error(2)

|ED| Differential linearity error(2)

|EL| Integral linearity error(2)

3

TBD

1

TBD

2

TBD LSB

3

TBD

2

TBD

1. TBD = to be determined.

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 ΣIINJ(PIN) in Section 5.3.12 does not

affect the ADC accuracy.

55/67

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