STWBC-EP datasheet(25/32 Pages) STMICROELECTRONICS

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STWBC-EP

Electrical characteristics

6.9.7

10-bit SAR ADC characteristics

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

and TA unless otherwise specified.

ADC accuracy characteristics

See Figure 18 for more details about the ADC accuracy parameter definition.

Table 13. ADC characteristics

Symbol

Parameter

Min.

Typ.

Max.

Unit

Resolution

bit

RADCIN

ADC input impedance(1)

1. Maximum input analog voltage cannot exceed VDD/VDDA.



VIN

Input conversion voltage range

1.25(1),(2)

2. Exceeding the maximum voltage on the TANK_VOLTAGE, VTARGET, COIL_TEMP, ISENSE, QFOD_ADC

signals has to be avoided since it may impact the ADC conversion accuracy defined in Table 14.

Vref

ADC main reference voltage(3)

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

1.250

Table 14. ADC accuracy characteristic at VDD/VDDA = 5 V

Symbol

Parameter

Min.(1)

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

Typ.(2)

2. Operating temperature: TA = 25 °C.

Max.(1)

Unit

|EO|

Offset error(3), (4)

3. ADC accuracy vs. negative injection current. The 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 that a Schottky diode (pin to ground) has to be added to standard analog pins

which may potentially inject a negative current. Any positive injection current within the limits specified for

IINJ(PIN) and IINJ(PIN) in the I/O port pin characteristics section does not affect the ADC accuracy. The ADC

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

4. Results in manufacturing test mode.

0.5

LSB

|EG|

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

5. Gain error evaluated with the two-point method.

0.4

EOG

Offset + Gain error (5), (6)

6. Temperature operating range: 0 ºC

 TA  85 ºC.

-8.3

8.9

EOG

Offset + Gain error(5), (7)

7. Temperature operating range: -25 ºC

 TA  105 ºC.

-10.9

10.9

EOG

Offset + Gain error(5), (8)

8. Temperature operating range: -40 ºC

 TA  105 ºC.

-13.8

10.9

|ED|

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

0.8

|EL|

Integral linearity error(3), (4)

2.0

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