AN2615 datasheet(22/37 Pages) STMICROELECTRONICS

Part #	AN2615

Description	In general the ADC embedded in the ST7 microcontroller

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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AN2615

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Figure 14 shows the relationship between the voltage measured by the ADC Vmeasured

(average of the 16 readings measured by the converter) and the input voltage Vin.

Figure 14.

Measured vs input for positive voltages

Figure 15 shows the relationship between the error voltage (as given in Table 1 in the

column ‘difference (Vmeasured - Vin’)) and the input voltage Vin.

Figure 15.

Error vs input for positive input voltages

Note:

It may be seen from the readings in Table 1 and Figure 15, that for the positive input

between 0 to 1 V the maximum error is around 500 µV for an average of 16 conversions.

Thus the difference between the maximum and minimum values in a loop of 16 is around

500 µV. This shows that averaging has increased accuracy. The accuracy without averaging

is approx 1mV.

The variations of the 16 values may be due to changes in the input voltage itself, as the time

taken for 16 readings is very long (around 16 s).

AN2615 Datasheet(PDF) 22 Page - STMicroelectronics