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A-D CONVERTER
8.4 Absolute accuracy and differential non-linearity error
8.4.2 Differential non-linearity error
The differential non-linearity error indicates the difference between the 1 LSB step width (the ideal analog
input voltage width while the same output code is expected to output) of an A-D converter with ideal
characteristics and the actual measured step width (the actual analog input voltage width while the same
output code is output). For example, in the case of the 10-bit mode, when V
of an A-D converter with ideal characteristics is 5 mV, but if the differential non-linearity error is ±1 LSB,
the actual measured 1 LSB width is 0 to 10 mV.
Output code
(A-D conversion result)
Fig. 8.4.2 Differential non-linearity error in 10-bit mode
8–14
009
16
1 LSB width with ideal
008
16
A-D conversion characteristics
007
16
006
16
005
16
004
16
003
16
002
16
001
16
000
16
0
5
10
7751 Group User's Manual
Differential non-linearity error
15
20
25
30
Analog input voltage (mV)
=5.12 V, the 1 LSB width
REF
35
40
45
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