ST10F276 datasheet(188/229 Pages) STMICROELECTRONICS

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Electrical characteristics

ST10F276

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Nonlinearity error

Nonlinearity error is the deviation between actual and the best-fitting A/D conversion charac-

teristics (see Figure 46):

–

Differential nonlinearity error is the actual step dimension versus the ideal one (1

LSBIDEAL).

–

Integral nonlinearity error is the distance between the center of the actual step and

the center of the bisector line, in the actual characteristics. Note that for integral

nonlinearity error, the effect of offset, gain and quantization errors is not included.

Note:

Bisector characteristic is obtained drawing a line from 1/2 LSB before the first step of the

real characteristic, and 1/2 LSB after the last step again of the real characteristic.

23.7.3

Total unadjusted error

The total unadjusted error (TUE) specifies the maximum deviation from the ideal character-

istic: The number provided in the datasheet represents the maximum error with respect to

the entire characteristic. It is a combination of the offset, gain and integral linearity errors.

The different errors may compensate each other depending on the relative sign of the offset

and gain errors. Refer to Figure 46, see TUE.

Figure 46.

A/D conversion characteristic

(2)

(1)

(3)

(4)

(5)

Offset error OFS

Gain error GE

1 LSB (ideal)

VAIN (LSBIDEAL)

[LSBIDEAL = VAREF / 1024]

Digital

out

(HEX)

3FF

3FE

3FD

3FC

3FB

3FA

005

004

003

002

001

000

007

006

(1) Example of an actual transfer curve

(2) The ideal transfer curve

(3) Differential Nonlinearity Error (DNL)

(4) Integral Nonlinearity Error (INL)

(5) Center of a step of the actual transfer curve

(6) Quantization Error (1/2 LSB)

(7) Total Unadjusted Error (TUE)

1024

1022

1020

1018

(6)

(7)

Bisector characteristic

Ideal characteristic

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