ST72561 datasheet(249/262 Pages) STMICROELECTRONICS

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ST72561

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ADC CHARACTERISTICS (Cont’d)

ADC Accuracy with fCPU=8 MHz, fADC=4 MHz RAIN< 10kΩ, VDD= 5V

Figure 148. ADC Accuracy Characteristics

Notes:

1) ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) analog

input pins should be avoided as this significantly reduces the accuracy of the conversion being performed on another

analog input. It is recommended to add a Schottky diode (pin to ground) to standard analog pins which may potentially

inject negative current. The effect of negative injection current on robust pins is specified in Section 12.9.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 12.9 does not affect the ADC

accuracy.

Symbol

Parameter

Conditions

Typ

Max

Unit

|ET|

Total unadjusted error 1)

LSB

|EO|

Offset error 1)

2.5

|EG|

Gain Error 1)

|ED|

Differential linearity error1)

1.5

|EL|

Integral linearity error 1)

1.5

1LSBIDEAL

1LSB

IDEA L

DDA

SSA

–

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

123

4567

1021 1022 1023 1024

(1)

(2)

(3)

VDDA

VSSA

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