STM32F103C8 datasheet(55/67 Pages) STMICROELECTRONICS

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STM32F103xx

Electrical characteristics

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RAIN

External input impedance

TBD(2)(3)

Ω

CAIN

External capacitor on analog

input

Ilkg

Negative input leakage current

on analog pins

VIN < VSS, | IIN | < 400 µA

on adjacent analog pin

µA

RADC

Sampling switch resistance

Ω

CADC

Internal sample and hold

capacitor

5pF

tCAL

Calibration time

fADC = 14MHz

5.9

µs

1/fADC

tlat

Injection conversion latency

fADC = 14 MHz

0.214

µs

31/fADC

Sampling time

fADC = 14 MHz

0.107

17.1

µs

tSTAB

Power-up time

µs

tCONV

Total conversion time (including

sampling time)

fADC = 14 MHz

118

µs

14 (1.5 for sampling

+12.5 for successive

approximation)

1/fADC

TBD = to be determined.

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.

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)

TBD = to be determined.

Symbol

Parameter

Conditions

Typ

Max

Unit

|ET|

Total unadjusted error(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.

3TBD

LSB

|EO|

Offset error(2)

1TBD

|EG|Gain Error

(2)

2TBD

|ED|

Differential linearity error(2)

3TBD

|EL|

Integral linearity error(2)

2TBD

Table 39.

ADC characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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