参数资料
型号: MB90246APFV
厂商: FUJITSU LTD
元件分类: 微控制器/微处理器
英文描述: 16-bit Proprietary Microcontroller
中文描述: 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP100
封装: PLASTIC, LQFP-100
文件页数: 76/100页
文件大小: 1956K
代理商: MB90246APFV
76
MB90246A Series
7. Notes on Using A/D Converter
Select the output impedance value for the external circuit of analog input according to the following conditions.
Output impedance values of the external circuit of 300
or lower are recommended.
When capacitors are connected to external pins, the capacitance of several thousand times the internal capacitor
value is recommended to minimized the effect of voltage distribution between the external capacitor and internal
capacitor.
When the output impedance of the external circuit is too high, the sampling time for analog voltages may not
be sufficient (sampling time = 0.56
μ
s @machine clock of 16 MHz).
Error
The smaller the | AVRH – AVRL |, the greater the error would become relatively.
8. 8-bit D/A Converter Electrical Characteristics
(AV
CC
= V
CC
= 4.5 V to 5.5 V, AV
SS
= V
SS
= 0.0 V, T
A
= –30
°
C to +70
°
C)
Parameter
Symbol
Pin name
Condition
Value
Typ.
8
Unit
Min.
Max.
8
±
0.9
Resolution
Differential linearity error
bit
LSB
Absolute accuracy
V
CC
= DVRH = 5.0 V,
DVRL = 0.0 V
Load capacitance:
20 pF
1.2
%
Conversion time
Analog power supply
voltage
10
1.0
20
V
CC
μ
s
V
V
mA
DVRH
DVRL
DVRH
V
SS
+ 2.0
V
SS
DVRH – DVRL 2.0 V
During conversion
When the CPU is
stopped
V
CC
– 2.0
1.5
Reference voltage
supply current
I
D
I
DH
DVRH
10
μ
A
Analog output
impedance
28
k
Block diagram of analog input circuit model
Note: Listed values must be considered as standards.
Comparator
Analog input pin
R
ON1
: Approx. 300
R
ON2
: Approx. 150
C
0
C
1
: Approx. 4 pF
R
ON1
R
ON2
C
0
C
1
Comparator
Comparator
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