SH7018 datasheet(291/431 Pages) RENESAS

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The above four kinds of error are described below with reference to figure 13.7. For the sake of

clarity, this figure shows 3-bit A/D conversion rather than 10-bit A/D conversion. Offset error (see

figure 13.7 (1)) is the deviation between the actual A/D conversion characteristic and the ideal

A/D conversion characteristic when the digital output value changes from the minimum value

(zero voltage) of 0000000000 (000 in the figure) to 0000000001 (001 in the figure ). Full-scale

error (see figure 13.7 (2)) is the deviation between the actual A/D conversion characteristic and the

ideal A/D conversion characteristic when the digital output value changes from 1111111110 (110

in the figure) to the maximum value (full-scale voltage) of 111111111 (111 in the figure).

Quantization error is the deviation inherent in the A/D converter, given by 1/2 LSB (see figure

13.7 (3)). Nonlinearity error is the deviation between the actual A/D conversion characteristic and

the ideal A/D conversion characteristic from zero voltage to full-scale voltage (see figure 13.7

(4)). This does not include offset error, full-scale error, and quantization error.

1/8

2/8

3/8

4/8

5/8

6/8

7/8

111

110

101

100

011

010

001

000

Analog input

voltage

(3) Quantization

error

(4) Nonlinearity

error

(2) Full-scale error

Ideal A/D conversion

characteristic

Digital output

FS: Full-scale voltage

Actual A/D conversion

characteristic

(1) Offset error

Ideal A/D conversion

characteristic

Digital output

Analog input

voltage

Figure 13.7

A/D Conversion Precision Definitions

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