ST7DALIF2 datasheet(155/171 Pages) STMICROELECTRONICS

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ST7DALIF2

Electrical characteristics

155/171

Figure 93.

ADC accuracy characteristics with amplifier disabled

Glossary:

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.

Table 90.

ADC Accuracy with VDD=5.0 V

Symbol

Parameter

Conditions

Typ

Max 1)

Unit

|ET|

Total unadjusted error

(1)

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 20.2 does not affect the ADC

accuracy.

fCPU=8 MHz, fADC=4 MHz

(2),

VDD=5.0 V

Data based on characterization results over the whole temperature range, not tested in production.

LSB

|EO|

Offset error 2)

1.5

|EG|

Gain Error 2)

24.5

|ED|

Differential linearity

error 2)

2.5

4.5

|EL|

Integral linearity error 2)

2.5

4.5

1LSBIDEAL

1LSB

IDEAL

–

1024

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

Vin (LSBIDEAL)

Digital Result ADCDR

1023

1022

1021

234567

1021 1022 1023 1024

(example of actual transfer curve)

(Ideal transfer curve)

(endpoint correlation line)

VDD

VSS

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