RX113 datasheet(104/131 Pages) RENESAS

104 / 131 page

R01DS0216EJ0120 Rev.1.20

Page 104 of 131

Sep 07, 2020

RX113 Group

5. Electrical Characteristics

Figure 5.57

Illustration of A/D Converter Characteristic Terms

Absolute accuracy

Absolute accuracy is the difference between output code based on the theoretical A/D conversion characteristics, and the

actual A/D conversion result. When measuring absolute accuracy, the voltage at the midpoint 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 analog input voltage. For example, if 12-bit resolution is used and if reference

voltage (VREFH0 = 3.072 V), then 1-LSB width becomes 0.75 mV, and 0 mV, 0.75 mV, 1.5 mV, ... are used as analog

input voltages.

If analog input voltage is 6 mV, absolute accuracy = ±5 LSB means that the actual A/D conversion result is in the range

of 003h to 00Dh though an output code, 008h, can be expected from the theoretical A/D conversion characteristics.

Integral nonlinearity error (INL)

Integral nonlinearity error is the maximum deviation between the ideal line when the measured offset and full-scale

errors are zeroed, and the actual output code.

Integral nonlinearity

error (INL)

Actual A/D conversion

characteristic

Ideal A/D conversion

characteristic

Analog input voltage

Offset error

Absolute accuracy

Differential nonlinearity error (DNL)

Full-scale error

FFFh

000h

Ideal line of actual A/D

conversion characteristic

1-LSB width for ideal A/D

conversion characteristic

Differential nonlinearity error (DNL)

1-LSB width for ideal A/D

conversion characteristic

VREFH0

(full-scale)

A/D converter

output code

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