AN2834 datasheet(13/45 Pages) STMICROELECTRONICS

No de pièce	AN2834

Description	How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices

PDF	45 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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13 / 45 page

DocID15067 Rev 2

13/45

AN2834

ADC errors

2.1.4

Integral linearity error

The integral linearity error is the maximum deviation between any actual transition and the

endpoint correlation line. The ILE is denoted by EL. It is represented in Figure 12.

The endpoint correlation line can be defined as the line on the A/D transfer curve that

connects the first actual transition with the last actual transition. EL is the deviation from this

line for each transition. The endpoint correlation line thus corresponds to the actual transfer

curve and has no relation to the ideal transfer curve.

The ILE is also known as the integral non linearity error (INL). The ILE is the integral of the

DLE over the whole range.

Figure 12. Integral linearity error representation

Example

If the first transition from 0 to 1 occurs at 550 µV and the last transition (FFEh to FFFh)

occurs at 3.298435 V (gain error), then the line on the transfer curve connecting the actual

digital codes 1h and FFFh will be the endpoint correlation line.

VAIN

Digital output

ai15480

Actual transfer curve

4095

550 μV

3.298435 V

AN2834 Fiches technique(PDF) 13 Page - STMicroelectronics