M30620FCAFP datasheet(454/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-137

2.7.13 Absolute Accuracy and Differential Non-Linearity Error

• Absolute accuracy

Absolute accuracy is the difference between output code based on the theoretical A-D conversion

characteristics, and actual A-D conversion result. When measuring absolute accuracy, the voltage at

the middle point of the width of analog input voltage (1-LSB width), that can meet the expectation of

outputting an equal code based on the theoretical A-D conversion characteristics, is used as an ana-

log input voltage. For example, if 10-bit resolution is used and if VREF (reference voltage) = 5.12 V,

then 1-LSB width becomes 5 mV, and 0 mV, 5 mV, 10 mV, 15 mV, 20 mV, ···· are used as analog input

voltages. If analog input voltage is 25 mV, “absolute accuracy =

± 3LSB” refers to the fact that actual

A-D conversion falls on a range from “00216” to ”00816” though an output code, “00516”, can be ex-

pected from the theoretical A-D conversion characteristics. Zero error and full-scale error are included

in absolute accuracy.

Also, all the output codes for analog input voltage between VREF and AVcc becomes “3FF16”.

00016

00116

00216

00316

00416

00516

00616

Analog input voltage (mV)

Theoretical A-D conversion

characteristic

10 1520

253035

5055

00716

00816

00916

00A16

00B16

+3LSB

–3LSB

Output code

(result of A-D conversion)

Figure 2.7.26. Absolute accuracy (10-bit resolution)

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