AN4073 datasheet(13/32 Pages) STMICROELECTRONICS

Part #	AN4073

Description	How to improve ADC accuracy when using STM32F2xx and STM32F4xx microcontrollers

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 32 page

DocID022945 Rev 5

13/32

AN4073

STM32F2 and STM32F4 practical measurements

Figure 5. Distribution of ADC codes when ART is ON and VIN = 0.3 V

3.2.2

ADC measurements when ART is OFF

Table 3 and Figure 6 show the ADC code distribution when ART is OFF.

5000

10000

15000

20000

25000

30000

35000

40000

Codes (dec)

no average

average 4

average 6

average 8

average 8 -4

MS19235V1

Table 3. Distribution of ADC codes when ART is OFF (units in LSB)

VIN

Raw data

Averaging by 4

Averaging by 6

Averaging by 8

delete 4

Dis-

persion

(LSB)

Sample

over

+-5 LSB

Dis-

persion

(LSB)

Sample

over

+-5 LSB

Dis-

persion

(LSB)

Sample

over

+-5 LSB

Dis-

persion

(LSB)

Sample

over

+-5 LSB

Dis-

persion

(LSB)

Sample

over

+-5 LSB

0.3 V

4.07 %

0.004

0 %

1.65 V

5.99 %

0.01 %

0.002 %

0 %

3 V

16.28 %

(1)

6.92 %

0.044 %

0.008 %

0.028 %

1. Worst case found in a total of more than100 tests

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