ST72340 datasheet(175/191 Pages) STMICROELECTRONICS

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13.13 10-BIT ADC CHARACTERISTICS

TA = -40°C to 85°C, unless otherwise specified

ADC Accuracy

Note:

1. Data based on characterization results over the whole temperature range.

2. ADC accuracy vs negative injection current: Injecting negative current on any of the analog input pins may reduce the

accuracy of the conversion being performed on another analog input.

The effect of negative injection current on robust pins is specified in Section 13.11 on page 172

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.10 does not affect the ADC

accuracy.

3. Data based on characterization results, monitored in production to guarantee 99.73% within ± max value from -40°C

to +125°C (± 3

σ distribution limits).

Figure 114. ADC Accuracy Characteristics

Symbol

Parameter

Conditions 1)2)

Typ

Max 3)

Unit

|ET|

Total unadjusted error

fCPU=8 MHz,

fADC=4 MHz

RAIN< 10kΩ,

VDD= 2.7V to 5.5V

LSB

|EO|Offset error

-1

-2

|EG|

Gain Error

-2

-4

|ED|

Differential linearity error

1LSBIDEAL

1LSB

IDEAL

–

1024

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

Vin (LSBIDEAL)

(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.

Digital Result ADCDR

1023

1022

1021

4567

1021 1022 1023 1024

(1)

(2)

(3)

VDD

VSS

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