STM8AF528A datasheet(86/125 Pages) STMICROELECTRONICS

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Electrical characteristics

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DocID14395 Rev 15

Figure 44. ADC accuracy characteristics

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.

Table 44. ADC accuracy for VDDA = 5 V

Symbol

Parameter

Conditions

Typ

Max(1)

1. Guaranteed by characterization results, not tested in production.

Unit

|ET|

Total unadjusted error(2)

2. ADC accuracy vs. injection current: Any positive or negative injection current within the limits specified for

IINJ(PIN) and ΣIINJ(PIN) in Section 10.3.6 does not affect the ADC accuracy.

fADC = 2 MHz

1.4

3(3)

3. TUE 2LSB can be reached on specific sales types on the whole temperature range.

LSB

|EO|

Offset error(2)

0.8

|EG|

Gain error(2)

0.1

|ED|

Differential linearity error(2)

0.9

|EL|

Integral linearity error(2)

0.7

1.5

|ET|

Total unadjusted error(2)

fADC = 4 MHz

1.9(4)

4. Target values.

4(4)

|EO|

Offset error(2)

1.3(4)

4(4)

|EG|

Gain error(2)

0.6(4)

3(4)

|ED|

Differential linearity error(2)

1.5(4)

2(4)

|EL|

Integral linearity error(2)

1.2(4)

1.5(4)

1LSBIDEAL

VDDA VSSA

–

1024

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

1023

1022

1021

567

1021102210231024

(1)

(2)

(3)

VDDA

VSSA

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