ST72324BJ2 datasheet(166/188 Pages) STMICROELECTRONICS

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Electrical characteristics

ST72324B

166/188

12.13.3

ADC accuracy

Figure 88.

ADC accuracy characteristics

Table 112.

ADC accuracy

Symbol

Parameter

Conditions

Typ

Max(1)

Unit

ROM and

8/16 Kbyte

Flash

32 Kbyte

Flash

|ET|

Total unadjusted error(2)

CPU in run mode @ fADC 2 MHz

LSB

|EO|

Offset error(2)

|EG|

Gain error(2)

0.5

4.5

|ED|

Differential linearity error(2)

|EL|

Integral linearity error(2)

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).

ADC accuracy vs. negative injection current: Injecting negative current may reduce the accuracy of the conversion being

performed on another analog input. Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in

Section 12.9 does not affect the ADC accuracy.

1LSBIDEAL

1LSB

IDEAL

AREF

SSA

–

1024

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

Vin (LSBIDEAL)

Digital result ADCDR

1023

1022

1021

234

567

1021

1023

(1)

(2)

(3)

VAREF

VSSA

(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.

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