AN4073 datasheet(12/32 Pages) STMICROELECTRONICS

Part #	AN4073

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

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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12 / 32 page

STM32F2 and STM32F4 practical measurements

AN4073

12/32

DocID022945 Rev 5

Note:

All results are evaluated versus a dispertion range of +-5 LSB around the value which

occurred the most in the histogram (see Figure 4).

Figure 4. Histogram graphical representation versus code dispersion

3.2.1

ADC measurements when ART is ON

Table 2 and Figure 5 show the ADC code distribution when ART is ON.

x-8 x-7 x-6 x-5 x-4 x-3 x-2 x-1 x x+1 x+2 x+3 x+4 x+5 x+6 x+7 x+8

Histogram

x +/- 5LSB

MS30764V1

Table 2. Distribution of ADC codes when ART is ON (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

6.37 %

0 %

1.65 V

7.90 %

0.05 %

0 %

3 V

21.53 %

(1)

0.38 %

0.13 %

0.006 %

0.04 %

1. Worst case found in a total of more than 100 tests

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