R01DS0140ED0100_FJ4_15 Datasheet, PDF (71/78 Pages) Renesas Technology Corp – 32-bit Single-Chip Microcontroller

Chapter 10
Chapter 10 Definition of terms
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
= (AV_REFP − AV_REFM)/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.
R01DS0140ED0100
71
Data Sheet