A-D Converter
M30240 Group
Rev.1.00 Sep 24, 2003 Page 251 of 360
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
REF (reference voltage) = 5.12 V, “differential non-linearity error = ±
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).
Figure 2.97: Differential non-linearity error (10-bit resolution)
000
16
001
16
002
16
003
16
004
16
005
16
006
16
0
Analog input voltage (mV)
Differential non-linear error
5 10 1520 2530 35 4045
007
16
008
16
009
16
Output code
(result of A-D conversion)
1LSB width for theoretical A-D
conversion characteristic
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