M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 546

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12.10 How to Read A/D Converter Characteristics Table
544
Here, special terms unique to the A/D converter are explained.
(1) Resolution
(2) Overall error
This is the minimum analog input voltage that can be identified. That is, the percentage of the analog input
voltage per bit of digital output is called 1 LSB (Least Significant Bit). The percentage of 1 LSB with respect to
the full scale is expressed by %FSR (Full Scale Range). %FSR indicates the ratio of analog input voltage that
can be converted as a percentage, and is always represented by the following formula regardless of the
resolution.
1 LSB is as follows when the resolution is 10 bits.
1 LSB = 1/2
Accuracy has no relation to resolution, but is determined by overall error.
This shows the maximum error value between the actual measured value and the theoretical value.
Zero-scale error, full-scale error, linearity error and errors that are combinations of these express the overall
error.
Note that the quantization error is not included in the overall error in the characteristics table.
1%FSR = (Max. value of analog input voltage that can be converted − Min. value of analog input voltage that
= 0.098%FSR
= (AV
= AV
10
can be converted)/100
= 1/1,024
DD
DD
/100
– 0)/100
CHAPTER 12 A/D CONVERTERS 0 AND 1
1 ...... 1
0 ...... 0
Figure 12-25. Overall Error
0
User’s Manual U16543EJ4V0UD
Ideal line
Analog input
Overall
error
AV
DD