STWBC datasheet(28/36 Pages) STMICROELECTRONICS

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Electrical characteristics

STWBC

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DocID027322 Rev 3

5.3.9

10-bit SAR ADC characteristics

The 10-bit SAR ADC oscillator parameters are specified under general operating conditions

for VDDA and TA unless otherwise specified.

ADC accuracy characteristics at VDD/VDDA 3.3 V

Table 15. ADC characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Resolution

bit

RADCIN ADC input impedance



VIN1

Conversion voltage range

for gain x1

01.25(1), (2)

1. Maximum input analog voltage cannot exceed VDDA.

2. Exceeding the maximum voltage on the SPARE_ADC signals for the related conversion scale must be

avoided since the ADC conversion accuracy can be impacted.

Vref

ADC main reference

voltage(3)

3. ADC reference voltage at TA = 25 °C.

1.250

Table 16. ADC accuracy characteristics at VDD/VDDA 3.3 V

Symbol

Parameter

Typ.(1)

1. Temperature operating: TA = 25 °C.

Min.(2)

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

Max.(2)

Unit

|ET|

Total unadjusted error(3), (4), (5)

3. 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 INJ(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.

4. Results in manufacturing test mode.

5. Data aligned with trimming voltage parameters.

2.8

LSB

|EO|

Offset error(3), (4), (5)

0.3

|EG|

Gain error(3), (4), (5), (6)

6. Gain error evaluation with the two point method.

0.4

EO+G

Offset + gain error(6), (7)

7. Temperature operating range: 0 ºC

 TA  85 ºC.

-8.5

9.3

EO+G

Offset + gain error(6), (8)

8. Temperature operating range: -25 ºC

 TA  105 ºC.

-11

EO+G

Offset + gain error(6), (9)

9. Temperature operating range: -40 ºC

 TA  105 ºC.

-14.3

11.3

|ED|

Differential linearity error(1), (2), (3)

0.5

|EL|

Integral linearity error(3), (4), (5)

1.4

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