STM32L151XD datasheet(119/154 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Electrical characteristics

129

tS(5)

Sampling time

Direct channels

2.4 V

≤VDDA ≤3.6 V

0.25

µs

Multiplexed channels

2.4 V

≤VDDA ≤3.6 V

0.56

Direct channels

1.8 V

≤VDDA ≤2.4 V

0.56

Multiplexed channels

1.8 V

≤VDDA ≤2.4 V

-4

384

1/fADC

tCONV

Total conversion time

(including sampling time)

fADC = 16 MHz

24.75

µs

4 to 384 (sampling phase) +12

(successive approximation)

1/fADC

CADC

Internal sample and hold

capacitor

Direct channels

Multiplexed channels

fTRIG

External trigger frequency

Regular sequencer

12-bit conversions

Tconv+1 1/fADC

6/8/10-bit conversions

Tconv

1/fADC

fTRIG

External trigger frequency

Injected sequencer

12-bit conversions

Tconv+2 1/fADC

6/8/10-bit conversions

Tconv+1 1/fADC

RAIN(6) Signal source impedance

tlat

Injection trigger conversion

latency

fADC = 16 MHz

219

281

-3.5

4.5

1/fADC

tlatr

Regular trigger conversion

latency

fADC = 16 MHz

156

219

-2.5

3.5

1/fADC

tSTAB

Power-up time

3.5

µs

1. The Vref+ input can be grounded if neither the ADC nor the DAC are used (this allows to shut down an external voltage

reference).

2. The current consumption through VREF is composed of two parameters:

- one constant (max 300 µA)

- one variable (max 400 µA), only during sampling time + 2 first conversion pulses

So, peak consumption is 300+400 = 700 µA and average consumption is 300 + [(4 sampling + 2) /16] x 400 = 450 µA at

1Msps

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

Refer to Section 4: Pin descriptions for further details.

4. VSSA or VREF- must be tied to ground.

5. Minimum sampling time is reached for an external input impedance limited to a value as defined in Table 66: Maximum

source impedance RAIN max.

6. External impedance has another high value limitation when using short sampling time as defined in Table 66: Maximum

source impedance RAIN max.

Table 64. ADC characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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