AN4073 datasheet(21/32 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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AN4073

STM32F4 ADC accuracy options

Figure 10. Distribution of ADC codes when ART is ON and VIN = 0.3 V

In the same conditions, when ART is ON, using the default STM32 configuration with

STM32F2xx or STM32F405/F415/F407/F417 would give a maximum dispersion of 21 LSB

(refer to Table 2) while, in this case, the maximum dispersion is 9 LSB.

This confirms that the default STM32 configuration embedded on these products allows to

achieve about 50 % of dispersion code versus STM32F2xx/F405/F415/F407/F417, and

about 75 % when Option 2 is active.

ADC measurements when ART is OFF

The following table and graph show the ADC code distribution when ART is OFF at three

different conditions: Default STM32 configuration, Option 1 and Option 2 are active.

Table 8.

Distribution of ADC codes when ART is OFF

VIN

Default

Option 1

Option 2

Dispersion

(LSB)

sample over

+-5 LSB

Dispersion

(LSB)

sample

over +5 LSB

Dispersion

(LSB)

sample over

+- 5 LSB

0.3 V

1.65 V

5000

10000

15000

20000

25000

30000

371

372

373

374

375

376

377

code (dec)

Default

Option 2

MS30758V1

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