STM32F383RC datasheet(95/125 Pages) STMICROELECTRONICS

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STM32F383xx

Electrical characteristics

109

6.3.16

12-bit ADC characteristics

Unless otherwise specified, the parameters given in Table 58 are preliminary values derived

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

voltage conditions summarized in Table 22.

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

IDDA(ADC)(1) Current consumption from VDDA

VDDA = 3.3 V

0.9

IVREF

Current on the VREF input pin

160(2)

220(2)

µA

fADC

ADC clock frequency

0.6

MHz

fS(3)

Sampling rate

0.05

MHz

fTRIG(3)

External trigger frequency

fADC = 14 MHz

823

kHz

1/fADC

VAIN

Conversion voltage range

0 (VSSA or VREF-

tied to ground)

-VREF+

RSRC(3)

Signal source impedance

See Equation 1 and

Table 59 for details

κΩ

RADC(3)

Sampling switch resistance

κΩ

CADC(3)

Internal sample and hold

capacitor

tCAL(3)

Calibration time

fADC = 14 MHz

5.9

µs

1/fADC

tlat(3)

Injection trigger conversion

latency

fADC = 14 MHz

0.214

µs

2(4)

1/fADC

tlatr(3)

Regular trigger conversion

latency

fADC = 14 MHz

0.143

µs

2(4)

1/fADC

tS(3)

Sampling time

fADC = 14 MHz

0.107

17.1

µs

1.5

239.5

1/fADC

tSTAB(3)

Power-up time

µs

tCONV(3)

Total conversion time (including

sampling time)

fADC = 14 MHz

µs

14 to 252 (tS for sampling +12.5 for

successive approximation)

1/fADC

1. During conversion of the sampled value (12.5 x ADC clock period), an additional consumption of 100 µA on IDDA and 60 µA

on IDD is present

2. Based on characterization, not tested in production.

3. Guaranteed by design, not tested in production.

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

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