ST7LITE29F2 datasheet(145/166 Pages) STMICROELECTRONICS

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ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Electrical characteristics

Doc ID 8349 Rev 5

145/166

Figure 90. ADC accuracy characteristics with amplifier disabled

●

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.

Figure 91. ADC accuracy characteristics with amplifier enabled

Note:

When the AMPSEL bit in the ADCDRL register is set, it is mandatory that fADC be less than

or equal to 2 MHz (if fCPU=8MHz, then SPEED=0, SLOW=1).

●

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.

1LSBIDEAL

1LSB

IDEAL

–

1024

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

Vin (LSBIDEAL)

(1) Example of an actual

transfer curve

(2) The ideal transfer curve

(3) End point correlation line

1023

1022

1021

234

567

1021 1022 1023 1024

(1)

(2)

(3)

VDD

VSS

Digital result ADCDR

1LSBIDEAL

1LSB

IDEAL

–

1024

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

Vin (LSBIDEAL)

(1) Example of an actual

transfer curve

(2) The ideal transfer curve

(3) End point correlation line

Digital Result ADCDR

704

108

456

701 702 703 704

(1)

(2)

(3)

VSS

430mV

62.5mV

Vin (OPAMP)

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