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Chapter 44 A/D Converter
7.Caution
• Overall error
Difference between an actual vale and a theoretical value, containing a zero transition error/full transition
error/linearity error
1LSB'(Ideal value) =
V
' (Ideal value)
OT
V
' (Ideal value) =
FST
Overall error of digital output N =
V
: Voltage at which digital output transit from (N+1) to N
NT
908
AVRH - AV
SS
1024
=
AV
+ 0.5LSB'
SS
AVRH - 1.5LSB'
- {1LSB' × (N - 1) + 0.5LSB'}
V
NT
3FF
3FE
Actual conversion characteristics
{1LSB (N- 1)+0.5LSB}
-
3FD
004
003
002
001
0.5 LSB'
AVss
[V]
[V]
[V]
1LSB'
Overall error
1.5 LSB'
V
NT
(Measurement
value)
Actual conversion characteristics
Ideal characteristics
Analog input
AVRH
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