DS07-16303-3E Datasheet, PDF (91/97 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91121
6. A/D Converter Glossary
• Resolution
The smallest change in analog voltage detected by A/D converter.
• Linearity error
A deviation of actual conversion characteristic from a line connecting the zero-traction point (between “00 0000
0000” ↔ “00 0000 0001”) to the full-scale transition point (between “11 1111 1110” ↔ “11 1111 1111”) .
• Differential linearity error
A deviation of a step voltage for changing the LSB of output code from ideal input voltage.
Linearity error
3FF
Actual conversion
characteristic
3FE
{1 LSB × (N − 1) + VOT}
3FD
VFST
(measured
value)
004
VNT
(measured value)
003
Actual conversion
characteristic
002
Ideal characteristic
001
VOT (measured value)
N+1
N
N−1
N−2
Differential linearity error
Ideal characteristic
Actual conversion
characteristic
V(N + 1)T
VNT ^{(measured value)}
(measured value)
Actual conversion characteristic
AVRL
Analog input
AVRH
AVRL
Analog input
AVRH
Linearity error of digital output N =
VNT − {1 LSB × (N − 1) + VOT}
[LSB]
1 LSB
Differential linearity error
of digital output N
=
V(N + 1)T − VNT
1 LSB
−1
[LSB]
1 LSB = ^{VFST − VOT} [V]
1022
VOT: A voltage for causing transition of digital output from (000)H to (001)H
VFST: A voltage for causing transition of digital output from (3FE)H to (3FF)H
VNT: A voltage for causing transition of digital output from (N − 1)H to N
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