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參數(shù)資料
| 型號： | MB89P677APFM |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 39/59頁 |
| 文件大小： | 795K |
| 代理商： | MB89P677APFM |
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44
MB89670R/670AR Series
5. A/D Converter Electrical Characteristics
(AVCC = VCC = 3.5 V to 6.0 V, FC = 10 MHz, AVSS = VSS = 0.0 V, TA = –40
°C to +85°C)
6. Notes on Using A/D Converter
The smaller | AVR – AVSS |, the greater the error would become relatively.
The output impedance of the external circuit for the analog input must satisfy the following conditions:
Output impedance of the external circuit < Approx. 10 k
If the output impedance of the external circuit is too
high, an analog voltage sampling time might be insufficient (sampling time = 6
s at 10 MHz oscillation).
An analog input equivalent circuit is shown below.
Parameter
Symbol
Pin name
Rated value
Unit
Remarks
Min.
Typ.
Max.
Resolution
——
—
10
bit
Linearity error
—
±2.0
LSB
AVCC =
AVR = VCC
Differential linearity
error
——
±1.5
LSB
Total error
—
±3.0
LSB
Zero transition voltage
VOT
AN0 to
AN7
AVSS – 1.5 LSB
AVSS + 0.5 LSB
AVSS + 2.5 LSB
mV
Full-scale transition
voltage
VFST
AN0 to
AN7
AVR – 3.5 LSB
AVR – 1.5 LSB
AVR + 0.5 LSB
mV
Interchannel disparity
——
—
4
LSB
A/D mode conversion
time
——
13.2
s
At 10 MHz
oscillation
Sense mode
conversion time
—
7.2
s
At 10 MHz
oscillation
Analog port input
current
IAIN
AN0 to
AN7
——
10
A
Analog input voltage
—
AN0 to
AN7
0—
AVR
V
Reference voltage
AVR
0
—
AVCC
V
Reference voltage
supply current
IR
AVR
—
200
A AVR = 5.0 V
Analog Input Equivalent Circuit
Comparator
C
60 pF
R
3 k
Sample hold circuit
closes for approx. 15 instruction cycles
after starting A/D conversion.
Analog channel selector
R
≤ 10 k is
recommended.
Analog input pin
If R > 10 k
, it is recommended
to connect an external capacitor
of approx. 0.1
F.
Microcontrollers internal circuit
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