參數(shù)資料
型號： MB90678PF
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 16-bit Proprietary Microcontroller
中文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 100/124頁
文件大?。?/td> 2584K
代理商： MB90678PF
MB90670/675 Series
100
(Continued)
7. Notes on Using A/D Converter
Select the output impedance value for the external circuit of analog input according to the following conditions.
Output impedance values of the external circuit of 7 k
or lower 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 time for analog voltages may not
be sufficient (sampling time = 3.75
μ
s @machine clock of 16 MHz).
Error
The smaller the | AVRH – AVRL |, the greater the error would become relatively.
Linearity error
N + 1
3FF
3FE
3FD
004
003
002
001
Analog input
AVRL
AVRH
Analog input
AVRL
AVRH
Actual conversion
characteristics
V
OT
(Mesured value)
V
(Mesured value)
Actual conversion
characteristics
V
NT
{1 LSB
×
(N – 1)
+ V
OT
’}
Theoretical
characteristics
D
D
Differential linearity error
Theoretical
characteristics
V
(Mesured value)
Actual conversion
characteristics
V
NT
(Mesured value)
Actual conversion
characteristics
Linearity error of
digital output N
V
OT:
Voltage at transition of digital output from “000
H
” to “001
H
”
V
FST
: Voltage at transition of digital output from “3FE
H
” to “3FF
H
”
[LSB]
V
NT
– {1 LSB
×
(N – 1) + V
OT
}
1 LSB’
=
[V]
AVRH – AVRL
1022
=
1 LSB
– 1 LSB [LSB]
V
(N + 1)T
– V
NT
1 LSB’
=
Differential linearity error
of digital output N
N – 2
N – 1
N
Block diagram of analog input circuit model
Note: Listed values must be considered as standards.
Comparator
Sample hold circuit
Analog input
R
ON1
: Approx. 1.5 k
(V
CC
= 5.0 V)
R
ON2
: Approx. 0.5 k
(V
CC
= 5.0 V)
R
ON3
: Approx. 0.5 k
(V
CC
= 5.0 V) C
0
: Approx. 60 pF
R
ON4
: Approx. 0.5 k
(V
CC
= 5.0 V) C
1
: Approx. 4 pF
R
ON1
R
ON2
R
ON3
R
ON4
C
0
C
1
相關(guān)PDF資料
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MB90678PFV 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-Bit Proprietary Microcontroller
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MB90800_09 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller
MB90803 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Microcontroller
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