R5F72115D160FPV datasheet(815/1228 Pages) RENESAS

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Section 17 A/D Converter (ADC)

Rev. 2.00 May. 08, 2008 Page 791 of 1200

REJ09B0344-0200

17.6

Definitions of A/D Conversion Accuracy

This LSI's A/D conversion accuracy definitions are given below.

• Resolution

The number of A/D converter digital conversion output codes

• Offset error

The deviation of the actual A/D conversion characteristic from the ideal A/D conversion

characteristic when the digital output value changes from the minimum voltage value (zero

voltage) B'000000000000 to B'000000000001. Does not include a quantization error (see

figure 17.7).

• Full-scale error

The deviation of the actual A/D conversion characteristic from the ideal A/D conversion

characteristic when the digital output value changes from B'111111111110 to the maximum

voltage value (full-scale voltage) B'111111111111. Does not include a quantization error (see

figure 17.7).

• Quantization error

The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 17.7).

• Nonlinearity error

The deviation of the actual A/D conversion characteristic from the ideal A/D conversion

characteristic between zero voltage and full-scale voltage. Does not include offset error, full-

scale error, or quantization error (see figure 17.7).

• Absolute accuracy

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

scale error, quantization error, and nonlinearity error.

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