HD64F2149YV datasheet(708/1075 Pages) RENESAS

708 / 1075 page

Section 20 A/D Converter

Rev. 3.00 Jan 18, 2006 page 680 of 1044

REJ09B0280-0300

AN0 to AN7

10 k

Ω

20 pF

To A/D converter

Note: Numeric values are reference values.

Figure 20.8 Analog Input Pin Equivalent Circuit

A/D Conversion Precision Definitions: H8S/2169 or H8S/2149 A/D conversion precision

definitions are given below.

• Resolution

The number of A/D converter digital output codes

• Offset error

The deviation of the analog input voltage value from the ideal A/D conversion characteristic

when the digital output changes from the minimum voltage value B'0000000000 (H'000) to

B'0000000001 (H'001) (see figure 20.10).

• Full-scale error

The deviation of the analog input voltage value from the ideal A/D conversion characteristic

when the digital output changes from B'1111111110 (H'3FE) to B'1111111111 (H'3FF) (see

figure 20.11).

• Quantization error

The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 20.9).

• Nonlinearity error

The error with respect to the ideal A/D conversion characteristic between the zero voltage and

the full-scale voltage. Does not include the offset error, full-scale error, or quantization error.

• Absolute precision

The deviation between the digital value and the analog input value. Includes the offset error,

full-scale error, quantization error, and nonlinearity error.

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