参数资料
型号: MB90F897PMT
元件分类: 微控制器/微处理器
英文描述: MICROCONTROLLER, PQFP48
封装: 7 X 7 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 71/84页
文件大小: 1773K
代理商: MB90F897PMT
MB90895 Series
DS07-13731-4E
73
(Continued)
To satisfy the A/D conversion precision standard, consider the relationship between the external impedance
and minimum sampling time and either adjust the resistor value and operating frequency or decrease the
external impedance so that the sampling time is longer than the minimum value.
The relationship between the external impedance and minimum sampling time
If the sampling time cannot be sufficient, connect a capacitor of about 0.1
F to the analog input pin.
<About errors>
As
AVR AVss become smaller, values of relative errors grow larger.
100
90
80
70
60
50
40
30
20
10
0
5
10
15
20
25
30
35
MB90F897/
MB90F897S
20
18
16
14
12
10
8
6
4
2
0
1
2
3
45
678
MB90F897/
MB90F897S
(At 4.5 V
≤ AVCC ≤ 5.5 V)
100
90
80
70
60
50
40
30
20
10
0
5
10
15
20
25
30
35
MB90F897/
MB90F897S
MB90F897/
MB90F897S
20
18
16
14
12
10
8
6
4
2
0
01
2
3
4
5
6
7
8
(At 4.0 V
≤ AVCC < 4.5 V)
[External impedance
= 0 k to 100 k]
[External impedance
= 0 k to 100 k]
[External impedance
= 0 k to 20 k]
[External impedance
= 0 k to 20 k]
Exte
rn
al
impe
dan
ce
[k
]
Ext
e
rn
al
imp
eda
nce
[
k
]
Exte
rn
al
impe
da
nce
[k
]
Ext
e
rnal
imp
e
d
ance
[
k
]
→ Minimum sampling time [s]
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