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STLUX

Electrical characteristics

126

ADC accuracy characteristics at VDD/VDDA 3.3 V

Table 89. ADC accuracy characteristics at VDD/VDDA 3.3 V

Symbol

Parameter

Conditions(1)

Typ.(2)

Min.(3)

Max.(3)

Unit

|ET|

Total unadjusted error(4), (5), (6)

fADC = 6 MHz gain 1

2.8

LSB

|EO|

Offset error(4), (5), (6)

0.3

|EG|

Gain error((4), (5), (6) (7)

0.4

EO+G Offset + gain error(7), (8)

-8.5

9.3

EO+G Offset + gain error(7), (9)

-11

EO+G Offset + gain error(7), (10)

-14.3

11.3

|ED|

Differential linearity error(2), (3), (4)

0.5

|EL|

Integral linearity error(4), (5), (6)

1.4

|ET|

Total unadjusted error(4), (5), (6)

fADC = 6 MHz gain 4 (11)

2.8

|EO|

Offset error(4), (5), (6)

0.3

|EG|

Gain error(4), (5), (6), (7)

0.4

EO+G Offset + gain error(7) (8)

-12.7

15.5

EO+G Offset + gain error(5), (9)

-16.7

18.8

EO+G Offset + gain error(7), (10)

-19.2

18.8

|ED|

Differential linearity error(4), (5), (6)

0.5

|EL|

Integral linearity error((4), (5), (6)

1.4

1. Measured with RAIN < 10 k

 (RAIN external series resistance interconnected between the AC signal generator and the

ADC input pin).

2. Temperature operating: TA = 25 °C.

3. Data based on characterization results, not tested in production.

4. ADC accuracy vs. negative injection current. Injecting negative current on any of the analog input pins should be avoided

as this reduces the accuracy of the conversion being performed on another analog input. It is recommended a Schottky

diode (pin to ground) to be added to standard analog pins which may potentially inject the negative current. Any positive

injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in the I/O port pin characteristic section does not affect

the ADC accuracy. The ADC accuracy parameters may be also impacted exceeding the ADC maximum input voltage VIN1

or VIN2.

5. Results in manufacturing test mode.

6. Data aligned with trimming voltage parameters.

7. Gain error evaluation with the two point method.

8. Temperature operating range: 0 ºC

 TA  85 ºC.

9. Temperature operating range: -25 ºC

 TA  105 ºC.

10. Temperature operating range: -40 ºC

 TA  105 ºC.

11. Product depending.

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