STM32F051K4 datasheet(76/104 Pages) STMICROELECTRONICS

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STM32F051x

Electrical characteristics

Doc ID 022265 Rev 3

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6.3.15

12-bit ADC characteristics

Unless otherwise specified, the parameters given in Table 54 are preliminary values derived

from tests performed under ambient temperature, fPCLK2 frequency and VDDA supply voltage

conditions summarized in Table 20.

Note:

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

Table 54.

ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply voltage for

ADC ON

2.4

3.6

fADC

ADC clock frequency

0.6

MHz

(1)

Sampling rate

0.05

MHz

fTRIG

(1)

External trigger frequency

fADC = 14 MHz

823

kHz

1/fADC

VAIN

Conversion voltage range

VDDA

RAIN

(1)

External input impedance

See Equation 1 and

Table 55 for details

RADC

(1)

Sampling switch resistance

CADC

(1)

Internal sample and hold

capacitor

tCAL

(1)

Calibration time

fADC = 14 MHz

5.9

µs

1/fADC

tlatr

(1)

Trigger conversion latency

fADC = fPCLK/2 = 14 MHz

0.196

µs

fADC = fPCLK/2

5.5

1/fPCLK

fADC = fPCLK/4 = 12 MHz

0.219

µs

fADC = fPCLK/4

10.5

1/fPCLK

fADC = fHSI14 = 14 MHz

0.188

0.259

µs

JitterADC

ADC jitter on trigger

conversion

fADC = fHSI14

-1

1/fHSI14

(1)

Sampling time

fADC = 14 MHz

0.107

17.1

µs

1.5

239.5

1/fADC

tSTAB

(1)

Power-up time

µs

tCONV

(1)

Total conversion time

(including sampling time)

fADC = 14 MHz

µs

14 to 252 (tS for sampling +12.5 for

successive approximation)

1/fADC

Guaranteed by design, not tested in production.

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