RA4W1 datasheet(79/105 Pages) RENESAS

79 / 105 page

R01DS0359EJ0100 Rev.1.00

Page 79 of 105

Mar 31, 2020

RA4W1 Datasheet

2. Electrical Characteristics

Figure 2.65

Illustration of 14-bit 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), which can meet the expectation of outputting an equal code based on the theoretical A/D

conversion characteristics, is used as the analog input voltage. For example, if 12-bit resolution is used and the reference

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

input voltages. If analog input voltage is 6 mV, an absolute accuracy of ±5 LSB means that the actual A/D conversion

result is in the range of 003h to 00Dh, though an output code of 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.

Differential nonlinearity error (DNL)

Differential nonlinearity error is the difference between 1-LSB width based on the ideal A/D conversion characteristics

and the width of the actually output code.

Offset error

Offset error is the difference between the transition point of the ideal first output code and the actual first output code.

Full-scale error

Full-scale error is the difference between the transition point of the ideal last output code and the actual last 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

3FFFh

0000h

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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