STM32F205RB datasheet(121/178 Pages) STMICROELECTRONICS

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STM32F20xxx

Electrical characteristics

177

6.3.20

12-bit ADC characteristics

Unless otherwise specified, the parameters given in Table 66 are derived from tests

performed under the ambient temperature, fPCLK2 frequency and VDDA supply voltage

conditions summarized in Table 14.

Table 66. ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Power supply

1.8(1)

-3.6

VREF+

Positive reference voltage

1.8(1)(2)

-VDDA

fADC

ADC clock frequency

VDDA = 1.8(1) to 2.4 V

0.6

MHz

VDDA = 2.4 to 3.6 V

0.6

MHz

fTRIG(3) External trigger frequency

fADC = 30 MHz with

12-bit resolution

1764

kHz

1/fADC

VAIN

Conversion voltage range(4)

0 (VSSA or VREF-

tied to ground)

-VREF+

RAIN(3) External input impedance

See Equation 1 for

details

RADC(3)(5) Sampling switch resistance

1.5

CADC(3)

Internal sample and hold

capacitor

-4

tlat(3)

Injection trigger conversion

latency

fADC = 30 MHz

0.100

µs

3(6)

1/fADC

tlatr(3)

Regular trigger conversion latency

fADC = 30 MHz

0.067

µs

2(6)

1/fADC

tS(3)

Sampling time

fADC = 30 MHz

0.100

µs

480

1/fADC

tSTAB(3) Power-up time

µs

tCONV(3)

Total conversion time (including

sampling time)

fADC = 30 MHz

12-bit resolution

0.5

16.40

µs

fADC = 30 MHz

10-bit resolution

0.43

16.34

µs

fADC = 30 MHz

8-bit resolution

0.37

16.27

µs

fADC = 30 MHz

6-bit resolution

0.3

16.20

µs

9 to 492 (tS for sampling +n-bit resolution for successive

approximation)

1/fADC

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