ST7L09 datasheet(93/104 Pages) STMICROELECTRONICS

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ST7L05, ST7L09

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ADC CHARACTERISTICS (Cont’d)

TA = -40 to +105°C unless otherwise specified

Table 20. ADC Accuracy with 3.0V

≤ V

DD ≤ 3.6V

Table 21. ADC Accuracy with 4.5V

≤ V

DD ≤ 5.5V

Notes:

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

2. ADC accuracy versus 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 91. Any positive injection cur-

rent within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.8 does not affect the ADC accuracy.

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

+105°C (± 3

σ distribution limits).

Figure 71. ADC Accuracy Characteristics

Symbol

Parameter

Conditions

Typ

Max3)

Unit

| ET |

Total unadjusted error

fCPU = 4 MHz, fADC = 2 MHz

1)2)

0.7

1.8

LSB

| EO |

Offset error

0.3

0.9

| EG |

Gain error

0.4

1.4

| ED |

Differential linearity error

0.5

0.8

| EL |

Integral linearity error

0.4

0.8

Symbol

Parameter

Conditions

Typ

Max3)

Unit

| ET |

Total unadjusted error

fCPU = 8 MHz, fADC = 4 MHz

1)2)

0.9

2.1

LSB

| EO |

Offset error

0.3

0.9

| EG |

Gain error

0.6

1.5

| ED |

Differential linearity error

0.5

0.9

| EL |

Integral linearity error

0.5

0.8

1LSBIDEAL

1LSB

IDEAL

DDA

SSA

–

256

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

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

255

254

345

253 254 255 256

(1)

(2)

(3)

VDDA

VSSA

253

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