ST7LITE20 datasheet(117/131 Pages) STMICROELECTRONICS

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ADC CHARACTERISTICS (Cont’d)

ADC Accuracy with VDD=5.0V

Notes:

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

2) Injecting negative current on any of the analog input pins significantly reduces the accuracy of any conversion being

performed on any analog input.

Analog pins can be protected against negative injection by adding a Schottky diode (pin to ground). Injecting negative

current on digital input pins degrades ADC accuracy especially if performed on a pin close to the analog input pins.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.8 does not affect the ADC

accuracy.

Figure 93. ADC Accuracy Characteristics with amplifier disabled

Symbol

Parameter

Conditions

Typ

Max

Unit

Total unadjusted error 2)

fCPU=8MHz, fADC=4MHz

TBD

4.5

LSB

Offset error 2)

TBD

Gain Error 2)

TBD

3.5

Differential linearity error 2)

TBD

Integral linearity error 2)

TBD

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

345

1021 1022 1023 1024

(1)

(2)

(3)

VDD

VSS

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