参数资料
型号: MB90F523PFV-G
厂商: FUJITSU LTD
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP120
封装: PLASTIC, QFP-120
文件页数: 126/127页
文件大小: 2636K
代理商: MB90F523PFV-G
MB90520 Series
98
(Continued)
7. Notes on Using A/D Converter
The impedance value of about 5 k
or lower for the external circuit of analog input are recommended.
When capacitors are connected to external pins, the capacitance of several thousand times the internal capacitor
value is recommended to minimized the effect of voltage distribution between the external capacitor and internal
capacitor.
When the output impedance of the external circuit is too high, the sampling period for analog voltages may not
be sufficient (sampling period = 4.00
s @machine clock of 16 MHz).
Error
The smaller the | AVRH – AVRL |, the greater the error would become relatively.
Linearity error
N + 1
N
N – 1
N – 2
3FF
3FE
3FD
004
003
002
001
Analog input
AVRL
AVRH
Analog input
AVRL
AVRH
Actual conversion
characteristics
VOT (mesured value)
VFST
(mesured value)
Actual conversion
characteristics
VNT
{1 LSB
× (N – 1)
+ VOT’}
Theoretical
characteristics
D
ig
it
a
l
o
u
tp
u
t
D
ig
it
a
l
o
u
tp
u
t
Differential linearity error
Theoretical
characteristics
V(N + 1)T
(mesured value)
Actual conversion
characteristics
VNT (mesured value)
Actual conversion
characteristics
Linearity error of
digital output N
VOT: Voltage at transition of digital output from “000H” to “001H
VFST: Voltage at transition of digital output from “3FEH” to “3FFH
[LSB]
VNT – {1 LSB
× (N – 1) + VOT}
1 LSB’
=
[V]
VFST – VOT
1022
=
1 LSB
– 1 LSB [LSB]
V(N + 1)T – VNT
1 LSB’
=
Differential linearity error
of digital N
(mesured value)
Block diagram of analog input circuit model
Note: Listed values must be considered as standards.
Comparator
Analog input
C
MB90523
RON: Approx. 1.5 k
C:
Approx. 3.0 pF
MB90F523
RON: Approx. 3.0 k
C:
Approx. 65 pF
RON
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