AN2615 datasheet(25/37 Pages) STMICROELECTRONICS

Part #	AN2615

Description	In general the ADC embedded in the ST7 microcontroller

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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AN2615

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Figure 17 shows the relationship between measured voltages Vmeasured (average of the 16

readings measured by the converter) and input voltage Vin (as measured by the multimeter)

for negative voltages.

Figure 17.

Measured vs input for negative voltages

Figure 18.

Error vs input for negative input voltages

Figure 18, shows that for negative input voltages varying from 0 to -1 V, the maximum error

is around -2.89 mV for -1 V input. An error of 0.5 mV occurs for an input value of -269 mV

-778.54

-780.59

-2.05

0.37

-818.25

-820.42

-2.17

0.43

-858.27

-860.61

-2.34

0.56

-898.57

-901.07

-2.5

0.2

-938.31

-940.94

-2.63

0.67

-978.21

-981.03

-2.82

0.43

Table 2.

Results for negative input voltages (continued)

Vin (mV)

(taken from multimeter)

Vmeasured (mV)

Difference (mV)

(Vmeasured - Vin)

Error in max and min input

measured in the loop (mV)

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