STM32F103xC datasheet(98/123 Pages) STMICROELECTRONICS

98 / 123 page

Electrical characteristics

STM32F103xC, STM32F103xD, STM32F103xE

98/123

Doc ID 14611 Rev 7

5.3.18

12-bit ADC characteristics

Unless otherwise specified, the parameters given in Table 58 are derived from tests

performed under ambient temperature, fPCLK2 frequency and VDDA supply voltage

conditions summarized in Table 10.

Note:

It is recommended to perform a calibration after each power-up.

Table 58.

ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Power supply

2.4

3.6

VREF+

Positive reference voltage

2.4

VDDA

IVREF

Current on the VREF input

160(1)

220(1)

µA

fADC

ADC clock frequency

0.6

MHz

(2)

Sampling rate

0.05

MHz

fTRIG

(2)

External trigger frequency

fADC = 14 MHz

823

kHz

1/fADC

VAIN

Conversion voltage range(3)

0 (VSSA or VREF-

tied to ground)

VREF+

RAIN

(2)

External input impedance

See Equation 1 and

Table 59 for details



RADC

(2)

Sampling switch resistance



CADC

(2)

Internal sample and hold

capacitor

8pF

tCAL

(2)

Calibration time

fADC = 14 MHz

5.9

µs

1/fADC

tlat

(2)

Injection trigger conversion

latency

fADC = 14 MHz

0.214

µs

3(4)

1/fADC

tlatr

(2)

Regular trigger conversion

latency

fADC = 14 MHz

0.143

µs

2(4)

1/fADC

(2)

Sampling time

fADC = 14 MHz

0.107

17.1

µs

1.5

239.5

1/fADC

tSTAB

(2)

Power-up time

µs

tCONV

(2)

Total conversion time

(including sampling time)

fADC = 14 MHz

µs

14 to 252 (tS for sampling +12.5 for

successive approximation)

1/fADC

Based on characterization results, not tested in production.

Guaranteed by design, not tested in production.

VREF+ can be internally connected to VDDA and VREF- can be internally connected to VSSA, depending on the package.

Refer to Section 3: Pinouts and pin descriptions for further details.

For external triggers, a delay of 1/fPCLK2 must be added to the latency specified in Table 58.

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