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參數(shù)資料
| 型號(hào)： | MB90F57APMT |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP120 |
| 封裝： | PLASTIC, LQFP-120 |
| 文件頁(yè)數(shù)： | 5/133頁(yè) |
| 文件大?。?/td> | 2509K |
| 代理商： | MB90F57APMT |
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MB90570 Series
102
(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 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
value
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
value
VNT (mesured value)
Actual conversion value
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
Equipment of analog input circuit model
Note: Listed values must be considered as standards.
Comparator
Analog input
C0
C1
MB90573/4, MB90V570/A
R
1.5 K, C 30 pF
MB90F574/A
R
3.0 K, C 65 pF
MB90574A
R
2.2 K, C 45 pF
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