參數(shù)資料
型號(hào)： MB95R203P-G-SH-NE2
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 10 MHz, MICROCONTROLLER, PDIP24
封裝： 6.40 MM X 22.86 MM, 4.80 MM HEIGHT, 1.778 MM PITCH, PLASTIC, DIP-24
文件頁(yè)數(shù)： 36/56頁(yè)
文件大小： 1925K
代理商： MB95R203P-G-SH-NE2
MB95R203
DS07-12625-3E
41
(2) Notes on Using A/D Converter
About the external impedance of 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. Therefore, 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. Also,
if the sampling time cannot be sufficient, connect a capacitor of about 0.1
μF to the analog input pin.
About errors
|VCC
VSS| becomes smaller, values of relative errors grow larger.
R
C
Analog input
Note : The values are reference values.
Analog input equivalent circuit
2.7 V
≤ Vcc ≤ 3.6 V : R := 1.7 kΩ (Max) , C := 14.5 pF (Max)
Comparator
During sampling : ON
0
2
4
6
8
10
12
14
16
18
20
01
2
3
4
0
10
20
30
40
50
60
70
80
90
100
05
15
10
20
25
30
35
40
[External impedance
= 0 kΩ to 100 kΩ]
[External impedance
= 0 kΩ to 20 kΩ]
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
Minimum sampling time [
μs]
External
impedance
[k
Ω
]
The relationship between external impedance and minimum sampling time.
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