
95
FUJITSU SEMICONDUCTOR CONFIDENTIAL
r2.1
MB9A110 Series
DS706-00011-1v0-E
Definition of 12-bit A/D Converter Terms
Resolution
: Analog variation that is recognized by an A/D converter.
Linearity error
: Deviation of the line between the zero-transition point
(0b000000000000←→0b000000000001) and the full-scale transition point
(0b111111111110←→0b111111111111) from the actual conversion
characteristics.
Differential linearity error : Deviation from the ideal value of the input voltage that is required to change
the output code by 1 LSB.
VNT - {1LSB × (N - 1) + VOT}
Linearity error of digital output N =
1LSB
[LSB]
V(N + 1) T - VNT
Differential linearity error of digital output N =
1LSB
- 1 [LSB]
VFST - VOT
1LSB =
4094
N
: A/D converter digital output value.
VOT
: Voltage at which the digital output changes from 0x000 to 0x001.
VFST : Voltage at which the digital output changes from 0xFFE to 0xFFF.
VNT
: Voltage at which the digital output changes from 0x(N 1) to 0xN.
Linearity error
Differential linearity error
Digit
al
output
Digit
al
output
Actual conversion
characteristics
Actual conversion
characteristics
Ideal characteristics
(Actually-
measured
value)
Actual conversion
characteristics
Actual conversion characteristics
(Actually-measured
value)
(Actually-measured value)
Ideal characteristics
(Actually-measured
value)
Analog input
(Actually-measured
value)
0x001
0x002
0x003
0x004
0xFFD
0xFFE
0xFFF
AVss
AVRH
AVss
AVRH
0x(N-2)
0x(N-1)
0x(N+1)
0xN
{1 LSB(N-1) + VOT}
VNT
VFST
VOT
VNT
V(N+1)T