参数资料
型号: MB90F489BPMC
厂商: FUJITSU LTD
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 15/124页
文件大小: 3283K
代理商: MB90F489BPMC
MB90480B/485B Series
DS07-13722-11E
111
About the external impedance of the analog input and its sampling time
A/D converter with sample and hold circuit. If the external impedance is too high to keep sufficient sampling
time, the analog voltage charged to the internal sample and hold capacitor is insufficient, adversely affecting
A/D conversion precision.
To satisfy the A/D conversion precision standard, consider the relationship between the external impedance
and minimum sampling time and either adjust the register value and operating frequency or decrease the
external impedance so that the sampling time is longer than the minimum value.
If the sampling time cannot be sufficient, connect a capacitor of about 0.1
μF to the analog input pin.
About errors
As |AVRH
AVSS| becomes smaller, values of relative errors grow larger.
Note : Concerning sampling time, and compare time when 3.6 V
≥ AVCC ≥ 2.7 V, then
Sampling time : 1.92
μs, compare time : 1.1 μs
Settings should ensure that actual values do not go below these values due to operating frequency changes.
R
C
During sampling : ON
Analog input
Comparator
Note: The values are reference values.
Analog input equivalent circuit
RC
MB90487B
2.5 k
Ω (Max) 31.0 pF (Max)
MB90F481B/F482B 1.9 k
Ω (Max) 25.0 pF (Max)
MB90F488B/F489B 1.9 k
Ω (Max) 25.0 pF (Max)
MB90F481B/F482B
MB90F488B/F489B
100
90
80
70
60
50
40
30
20
10
0
5
10
15
20
25
30
35
MB90487B/
MB90483C
MB90F481B/F482B
MB90F488B/F489B
20
18
16
14
12
10
8
6
4
2
0
0123456
8
7
MB90487B/
MB90483C
(External impedance
= 0 kΩ to 100 kΩ)
(External impedance
= 0 kΩ to 20 kΩ)
Minimum sampling time [
μs]
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
External
impedance
[k
Ω
]
The relationship between external impedance and minimum sampling time
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