STR73XF datasheet(45/53 Pages) STMICROELECTRONICS

45 / 53 page

STR73xF

Electrical parameters

45/53

on robust pins is specified in Section 3.3.5.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 3.3.5 does not

affect the ADC accuracy.

Calibration is needed once after each power-up.

Figure 21. ADC Accuracy Characteristics

Figure 22. Typical Application with ADC

1LSBIDEAL

1LSB

IDEAL

DDA

SSA

–

1024

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

(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.

1023

1022

1021

456

1021 1022 1023 1024

(1)

(2)

(3)

VDDA

VSSA

AINx

STR73X

VDD

±1

µA

0.6V

CADC

3.5pF

VAIN

RAIN

10-Bit A/D

Conversion

2.3k

Ω(max)

CAIN

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