ST7L19 datasheet(123/138 Pages) STMICROELECTRONICS

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ST7L15, ST7L19

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10-BIT ADC CHARACTERISTICS (cont’d)

Table 21. ADC Accuracy with 3V < VDD < 3.6V

Table 22. ADC Accuracy with 4.5V < VDD < 5.5V

Notes:

1. Data based on characterization results over the whole temperature range, monitored in production.

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 122

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in section 13.8 on page 113 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 100. ADC Accuracy Characteristics

Symbol

Parameter

Conditions

Typ

Max3)

Unit

|ET|

Total unadjusted error

fCPU = 4 MHz, fADC = 2 MHz

1)2)

2.8

5.7

LSB

|EO|

Offset error

0.25

1.2

|EG|

Gain error

0.6

2.3

|ED|

Differential linearity error

2.9

5.6

|EL|

Integral linearity error

2.6

5.3

Symbol

Parameter

Conditions

Typ

Max3)

Unit

|ET|

Total unadjusted error

fCPU = 8 MHz, fADC = 4 MHz

1)2)

LSB

|EO|

Offset error

|EG|

Gain error

|ED|

Differential linearity error

1.5

|EL|

Integral 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 actu-

al 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 devia-

tion 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

234567

1021 1022 1023 1024

(1)

(2)

(3)

VDD

VSS

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