STR750F datasheet(67/73 Pages) STMICROELECTRONICS

67 / 73 page

STR750F

Electrical parameters

67/71

Figure 32.

ADC accuracy characteristics

Table 42.

ADC accuracy

ADC Accuracy with fCK_SYS = 20 MHz, fADC=8 MHz, RAIN < 10 kΩ

This assumes that the ADC is calibrated(1)

Calibration is needed once after each power-up.

Symbol

Parameter

Conditions

Typ

Max

Unit

|ET|

Total unadjusted error (2) (3)

Refer to ADC Accuracy vs. Negative Injection Current on page 65

ADC Accuracy vs. MCO (Main Clock Output): the ADC accuracy can be significantly degraded when

activating the MCO on pin P0.01 while converting an analog channel (especially those which are close to

the MCO pin). To avoid this, when an ADC conversion is launched, it is strongly recommended to disable

the MCO.

VDDA_ADC=3.3 V

1.2

LSB

VDDA_ADC=5.0 V

1.2

|EO|

Offset error(2) (3)

VDDA_ADC=3.3 V

0.15

0.5

VDDA_ADC=5.0 V

0.15

0.5

Gain Error (2) (3)

VDDA_ADC=3.3 V

-0.8

-0.2

VDDA_ADC=5.0 V

-0.8

-0.2

|ED|

Differential linearity error(2) (3)

VDDA_ADC=3.3 V

0.7

0.9

VDDA_ADC=5.0 V

0.7

0.9

|EL|

Integral linearity error (2) (3)

VDDA_ADC=3.3 V

0.6

0.8

VDDA_ADC=5.0 V

0.6

0.8

1LSBIDEAL

1LSB

IDEAL

DDA

SSA

–

1024

-----------------------------------------

Vin

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) End point correlation line

ET=Total Unadjusted Error: maximum deviation

between the actual and the ideal transfer curves.

EO=Offset Error: deviation between the first actual

transition and the first ideal one.

EG=Gain Error: deviation between the last ideal

transition and the last actual one.

ED=Differential Linearity Error: maximum deviation

between actual steps and the ideal one.

EL=Integral Linearity Error: maximum deviation

between any actual transition and the end point

correlation line.

Digital Result ADCDR

1023

1022

1021

4567

1021 1022 1023 1024

(1)

(2)

(3)

VDDA

VSSA

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