mb91307r Fujitsu Microelectronics, Inc., mb91307r Datasheet - Page 90

• Manufacturer Part Number: mb91307r
• Description: 32-bit Microcontroller Cmos Fr60 Mb91307 Series
• Manufacturer: Fujitsu Microelectronics, Inc.

90
MB91307 Series
Definition of A/D Converter Terms
• Resolution
• Linear error
• Differential linear error
Differential linear error in digital output N =
Indicates the ability of the A/D converter to discriminate analog variation
Expresses the deviation between actual conversion characteristics and a straight line connecting the device’s
zero transition point (00 0000 0000←→00 0000 0001) and full scale transition point (11 1111 1110←→11
1111 1111)
Expresses the deviation of the logical value of input voltage required to create a variation of 1 LSB in output
code.
Linear error in digital output N
3FE
3FD
3FF
004
003
002
001
H
H
H
H
H
H
H
AVRL
{1 LSB × (N − 1) + V
1 LSB” =
1 LSB =
V
V
V
OT
FST
NT
: Voltage at which the digital output transitions from “000”
: Voltage at which the digital output transitions from (N-1) to N.
: Voltage at which the digital output transitions from “3FE”
Actual variation
V
AVRH − AVRL
TO
V
[Linear Error]
Analog input
FST
(measured value)
1022
1024
Theoretical values
TO
− V
}
OT
Actual variation
[V]
[V]
(measured
V
(measured
NT
V
value)
=
FST
value)
V
V (
NT
AVRH
(theoretical value)
N
− {1 LSB × (N − 1) + V
+
1 LSB
1
)
T
− V
1 LSB
N − 1
N − 2
N − 1
N − 2
NT
AVRL
−1
Actual variation
H
OT
H
[Differential linear error]
to “001”
}
to “3FF”
Theoretical
[LSB]
[LSB]
Analog input
H
Actual variation
.
H
.
(measured value)
V
NT
(measured
V
(N − 1)T
value)
AVRH