Datasheet

V850ES/JG3 CHAPTER 13 A/D CONVERTER
R01UH0015EJ0300 Rev.3.00 Page 439 of 870
Sep 30, 2010
(3) Quantization error
This is an error of ±1/2 LSB that inevitably occurs when an analog value is converted into a digital value. Because
the A/D converter converts analog input voltages in a range of ±1/2 LSB into the same digital codes, a quantization
error is unavoidable.
This error is not included in the overall error, zero-scale error, full-scale error, integral linearity error, or differential
linearity error in the characteristics table.
Figure 13-17. Quantization Error
Quantization error
1
......
1
0
......
0
0AV
REF0
Analog input
Digital output
1/2 LSB
1/2 LSB
(4) Zero-scale error
This is the difference between the actually measured analog input voltage and its theoretical value when the digital
output changes from 0…000 to 0…001 (1/2 LSB).
Figure 13-18. Zero-Scale Error
AV REF0
Analog input (LSB)
Digital output (lower 3 bits)
Ideal line
111
−10123
100
011
010
001
000
Zero-scale error