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参数资料
| 型号： | MB90F884BPMC |
| 厂商： | FUJITSU LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 14 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件页数： | 66/80页 |
| 文件大小： | 2171K |
| 代理商： | MB90F884BPMC |
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MB90880 Series
DS07-13743-5E
69
External impedance and sampling time for analog input
This is an A/D converter with a sample hold function. If high external impedance is preventing it from securing
sufficient sampling time, a sufficient analog voltage will not be charged in the internal sample hold capacitor,
affecting the accuracy of the A/D conversion. In order to satisfy the A/D conversion accuracy specifications,
adjust the register values and operating frequency or decrease the external impedance so that the sampling
time becomes longer than the minimum value, based on the relationship between the external impedance and
the minimum sampling time. If a sufficient sampling time cannot be secured, connect a capacitor with a ca-
pacitance of approximately 0.1
μF to the analog input pin.
Errors :
As | AVRH
AVSS | decreases, the absolute error increases.
R
C
Turned on during sampling ON
Analog input
Comparator
Note : These are reference values.
Model diagram of analog input circuit
RC
12.2 k
Ω (Max)
8.5 pF (Max)
0
5
10
15
20
25
30
35
0
10
20
30
40
50
60
70
80
90
100
012345678
0
2
4
6
8
10
12
14
16
18
20
Relation between external impedance and minimum sampling time
External
impedance
[k
Ω
]
External
impedance
[k
Ω
]
[External impedance = 0 k
Ω to 100 kΩ]
Minimum sampling time [
μs]
Minimum sampling time [
μs]
[External impedance = 0 k
Ω to 20 kΩ]
Flash memory device
MASK ROM device
Flash memory device
MASK ROM device
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