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參數(shù)資料
| 型號： | MB90246APFV |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, 16 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 75/100頁 |
| 文件大?。?/td> | 1959K |
| 代理商： | MB90246APFV |
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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
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
(AVCC = VCC = 4.5 V to 5.5 V, AVSS = VSS = 0.0 V, TA = –30
°C to +70°C)
Parameter
Symbol
Pin name
Condition
Value
Unit
Min.
Typ.
Max.
Resolution
—
—8
8
bit
Differential linearity error
—
±0.9
LSB
Absolute accuracy
—
VCC = DVRH = 5.0 V,
DVRL = 0.0 V
——
1.2
%
Conversion time
—
Load capacitance:
20 pF
—10
20
s
Analog power supply
voltage
—DVRH
VSS + 2.0
—
VCC
V
—DVRL
DVRH – DVRL
2.0 V
VSS
—VCC – 2.0
V
Reference voltage
supply current
ID
DVRH
During conversion
—
1.0
1.5
mA
IDH
DVRH
When the CPU is
stopped
——
10
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
RON1: Approx. 300
RON2: Approx. 150
C0: Approx. 60 pF
C1: Approx. 4 pF
RON1
RON2
C0
C1
Comparator
≥
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