DS07-16301-4E Datasheet, PDF (93/99 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller CMOS FR30 Series

MB91101/MB91101A
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)
AVRL
Analog input
AVRH
Differential linearity error
Ideal characteristic
N+1
Actual characteristic
N
N–1
N–2
AVRL
V(N + 1)T
VNT ^{(measured value)}
(measured value)
Actual conversion characteristic
Analog input
AVRH
Linearity error of
digital output N
=
VNT – {1 LSB × (N – 1) + VOT}
1 LSB
[LSB]
1 LSB = ^{VFST – VOT} [V]
1022
Differential linearity error
of digital output N
=
V(N + 1)T – VNT
1 LSB
– 1 [LSB]
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) to N
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