STM32F071C8 datasheet(83/122 Pages) STMICROELECTRONICS

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STM32F071x8 STM32F071xB

Electrical characteristics

fTRIG(2)

External trigger frequency

fADC = 14 MHz,

12-bit resolution

823

kHz

12-bit resolution

1/fADC

VAIN

Conversion voltage range

VDDA

RAIN(2)

External input impedance

See Equation 1 and

Table 58 for details

RADC(2)

Sampling switch

resistance

CADC(2)

Internal sample and hold

capacitor

tCAL(2)(3)

Calibration time

fADC = 14 MHz

5.9

µs

-83

1/fADC

WLATENCY(2)(4)

ADC_DR register ready

latency

ADC clock = HSI14

1.5 ADC

cycles + 2

fPCLK cycles

1.5 ADC

cycles + 3

fPCLK cycles

ADC clock = PCLK/2

4.5

fPCLK

cycle

ADC clock = PCLK/4

8.5

fPCLK

cycle

tlatr(2)

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

0.179

0.250

µs

JitterADC

ADC jitter on trigger

conversion

fADC = fHSI14

-1

1/fHSI14

tS(2)

Sampling time

fADC = 14 MHz

0.107

17.1

µs

1.5

239.5

1/fADC

tSTAB(2)

Stabilization time

1/fADC

tCONV(2)

Total conversion time

(including sampling time)

fADC = 14 MHz,

12-bit resolution

µs

12-bit resolution

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 should be taken into account.

2. Guaranteed by design, not tested in production.

3. Specified value includes only ADC timing. It does not include the latency of the register access.

4. This parameter specify latency for transfer of the conversion result to the ADC_DR register. EOC flag is set at this time.

Table 57. ADC characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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