PD70F3559 datasheet(78/85 Pages) RENESAS

78 / 85 page

R01DS0142ED0100

Data Sheet

Chapter 10

Definition of terms

Chapter 10 Definition of terms

The following sections describe the meaning of several terms used in this

document.

10.1 How to Read A/D Converter Characteristics Table

This section describes the meanings of the terms peculiar to the A/D converter.

(1)

Resolution

The minimum analog input voltage that can be identified, i.e. the ratio of the

analog input voltage to 1 digital output is called 1 LSB (Least Significant Bit).

The ratio of 1 LSB to the full scale is expressed as %FSR (Full Scale Range).

%FSR is the ratio, in percentage, of the range in which an analog input voltage

can be converted, and is expressed as follows regardless of the resolution.

1%FSR = (Maximum value of analog input voltage that can be converted

−

Minimum value of analog input voltage that can be converted)/100

= (AVREFP − AVREFM)/100

1 LSB is as follows at a resolution of 10 bits:

1 LSB = 1/210

= 1/1,024

= 0.098%FSR

1 LSB is as follows at a resolution of 12 bits:

1 LSB = 1/212

= 1/4,096

= 0.024%FSR

The accuracy is determined by the total error, regardless of the resolution.

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