STM32L081CB datasheet(83/110 Pages) STMICROELECTRONICS

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STM32L081xx

Electrical characteristics

Equation 1: RAIN max formula

The simplified formula above (Equation 1) is used to determine the maximum external

impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

tCAL(3)(5)

Calibration time

fADC = 16 MHz

5.2

µs

-83

1/fADC

WLATENCY(6)

ADC_DR register write

latency

ADC clock = HSI16

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(3)

Trigger conversion latency

fADC = fPCLK/2 = 16 MHz

0.266

µs

fADC = fPCLK/2

8.5

1/fPCLK

fADC = fPCLK/4 = 8 MHz

0.516

µs

fADC = fPCLK/4

16.5

1/fPCLK

fADC = fHSI16 = 16 MHz

0.252

0.260

µs

JitterADC

ADC jitter on trigger

conversion

fADC = fHSI16

-1

1/fHSI16

tS(3)

Sampling time

fADC = 16 MHz

0.093

10.03

µs

1.5

160.5

1/fADC

tUP_LDO(3)(5) Internal LDO power-up time

µs

tSTAB(3)(5)

ADC stabilization time

1/fADC

tConV(3)

Total conversion time

(including sampling time)

fADC = 16 MHz,

12-bit resolution

0.875

10.81

µs

12-bit resolution

14 to 173 (tS for sampling +12.5

for successive approximation)

1/fADC

1. VDDA minimum value can be decreased in specific temperature conditions. Refer to Table 58: RAIN max for fADC = 16 MHz.

2. A current consumption proportional to the APB clock frequency has to be added (see Table 34: Peripheral current

consumption in Run or Sleep mode).

3. Guaranteed by design.

4. Standard channels have an extra protection resistance which depends on supply voltage. Refer to Table 58: RAIN max for

fADC = 16 MHz.

5. This parameter only includes the ADC timing. It does not take into account register access latency.

6. This parameter specifies the latency to transfer the conversion result into the ADC_DR register. EOC bit is set to indicate the

conversion is complete and has the same latency.

Table 57. ADC characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

RAIN

fADC CADC





-------------------------------------------------------------- R

ADC

–



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