STM32L471VG datasheet(147/218 Pages) STMICROELECTRONICS

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STM32L471xx

Electrical characteristics

199

Equation 1: RAIN max formula

The 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).

RAIN

fADC CADC

()

----------------------------------------------------------------

RADC

–

Table 64. Maximum ADC RAIN(1)(2)

Resolution

Sampling cycle

@80 MHz

Sampling time [ns]

@80 MHz

RAIN max (Ω)

Fast channels(3)

Slow channels(4)

12 bits

2.5

31.25

100

N/A

6.5

81.25

330

100

12.5

156.25

680

470

24.5

306.25

1500

1200

47.5

593.75

2200

1800

92.5

1156.25

4700

3900

247.5

3093.75

12000

10000

640.5

8006.75

39000

33000

10 bits

2.5

31.25

120

N/A

6.5

81.25

390

180

12.5

156.25

820

560

24.5

306.25

1500

1200

47.5

593.75

2200

1800

92.5

1156.25

5600

4700

247.5

3093.75

12000

10000

640.5

8006.75

47000

39000

8 bits

2.5

31.25

180

N/A

6.5

81.25

470

270

12.5

156.25

1000

680

24.5

306.25

1800

1500

47.5

593.75

2700

2200

92.5

1156.25

6800

5600

247.5

3093.75

15000

12000

640.5

8006.75

50000

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