Differential Non-Linearity Error - Renesas M16C Series User Manual

M30240 Group

2.6.5.2 Differential non-linearity error

Differential non-linearity error refers to the difference between 1-LSB width based on the theoretical A-
D conversion characteristics (an analog input width that can meet the expectation of outputting an equal
code) and an actually measured 1-LSB width (analog input voltage width that outputs an equal code). If
10-bit resolution is used and if V
1LSB" refers to the fact that 1-LSB width actually measured falls on a range from 0 mV to 10 mV though
1-LSB width based on the theoretical A-D conversion characteristics is 5 mV (see 8.2 A-D converter's
standard characteristics).
Output code
(result of A-D conversion)
009
16
008
16
007
16
006
16
005
16
004
16
003
16
002
16
001
16
000
16
Figure 2.97: Differential non-linearity error (10-bit resolution)
Rev.1.00 Sep 24, 2003 Page 251 of 360
(reference voltage) = 5.12 V, "differential non-linearity error = ±
REF
1LSB width for theoretical A-D
conversion characteristic
0 5 10 15 20
Analog input voltage (mV)
Differential non-linear error
25 30 35 40 45
A-D Converter