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參數(shù)資料
| 型號： | MB90F897 |
| 廠商： | Fujitsu Limited |
| 英文描述： | 10-Bit Buffers/Drivers With 3-State Outputs 24-CFP -55 to 125 |
| 中文描述： | 16位微控制器專有 |
| 文件頁數(shù)： | 72/78頁 |
| 文件大小： | 746K |
| 代理商： | MB90F897 |
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MB90895 Series
72
7.
Notes on A/D Converter Section
Use the device with external circuits of the following output impedance for analog inputs:
Recommended output impedance of external circuits are: Approx. 3.9 k
or lower (4.5 V
≤
AVcc
≤
5.5 V)
(sampling period=2.00
μ
s at 16-MHz machine clock), Approx. 11 k
or lower (4.0 V
≤
AVcc < 4.5 V) (sampling
period=8.0
μ
s at 16-MHz machine clock).
If an external capacitor is used, in consideration of the effect by tap capacitance caused by external capacitors
and on-chip capacitors, capacitance of the external one is recommended to be several thousand times as high
as internal capacitor.
If output impedance of an external circuit is too high, a sampling period for an analog voltage may be insufficient.
About errors
As
AVR-AVss
become smaller, values of relative errors grow larger.
8.
Flash Memory Program/Erase Characteristics
Parameter
Conditions
Value
Unit
Remarks
Min
Typ
Max
Sector eraset time
(4 KB sector)
T
A
=
+
25
°
C,
V
CC
=
5.0 V
0.2
0.5
s
Excludes 00
H
programming
prior to erasure
Sector eraset time
(16 KB sector)
0.5
7.5
s
Excludes 00
H
programming
prior to erasure
Chip erase time
4
s
Excludes 00
H
programming
prior to erasure
Word (8 bit width)
programming time
16
3,600
μ
s
Except for the over head
time of the system
Program/Erase cycle
10,000
cycle
C
R
Analog input circuit model
Note : Use the values in the figure only as a guideline.
MB90F897/S
4.5 V
≤
AV
CC
≤
5.5 V
4.0 V
≤
AV
CC
<
4.5 V
R : 2.35 k
, C : 36.4 pF
R : 16.4 k
, C : 36.4 pF
Comparator
Analog input
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