ST10F296 datasheet(305/346 Pages) STMICROELECTRONICS

305 / 346 page

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ST10F296E

Electrical characteristics

305/346

Nonlinearity error

Nonlinearity error is the deviation between the actual and the best-fitting AD conversion

characteristics (see Figure 98):

–

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 effects of offset, gain and quantization errors are not

included.

Note:

The bisector characteristic is obtained by drawing a line from 1/2 LSB to a point before the

first step of the real characteristic, and another line from 1/2 LSB to a point after the last step

of the real characteristic (see Figure 98).

Total unadjusted error

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

characteristic. The value provided in this 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 (see TUE in Figure 98).

Figure 98.

AD conversion characteristic

Legend:

(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)

(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

1024

1022

1020

1018

(6)

(7)

Bisector characteristic

Ideal characteristic

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