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參數(shù)資料
| 型號： | MB4053M |
| 廠商： | FUJITSU LTD |
| 元件分類： | ADC |
| 英文描述： | 6-Channel 8-BIT A/D Converter |
| 中文描述： | 6-CH 8-BIT SINGLE-SLOPE ADC, SERIAL ACCESS, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大小： | 135K |
| 代理商： | MB4053M |
12
MB4053
I
APPLICATION EXAMPLES
Examples of analog voltage (0
to
5 V) A/D conversion with 10-bit resolution are shown in “PEAK LINEARITY
ERROR vs AMBIENT TEMPERATURE Ta” and “SUPPLY CURRENT vs AMBIENT TEMPERATURE”.
Reference Voltage: V
REF
= R
CC
............ 7-1
Ramp Current: I
R
= R
1
CC
......... 7-2
R
1
+ R
2
X
R
X
+ R
B
C
H
I
R
2
R
1
Input Voltage: = V
IN
= R
V
CC
................ 7-3
Ramp Time: t
R
..
IN
= R
(1 + R
C
H
R
REF
................. 7-4
R
X
+ R
B
V
REF
= 5 k
×
8 V = 5 V
3 k
+
5 k
CC
- V
REF
I
R
= V
μ
A
R
REF
H
×
V
REF
I
A
(min)
- I
R
H
×
V
REF
I
R
t
SL
≥
C
μ
s
t
Rmax
..
μ
s
If the ramp time is counted with a 1 MHz clock, the following
resolution is obtained.
μ
s
11
10
μ
s
R
1
3 k
R
2
5 k
R
B
20 k
R
X
120 k
R
REF
5 V
V
CC
= 8 V
I
1
I
2
I
3
I
4
I
5
I
6
V
REF
A
2
V
CC
RAMP
START
GND
R
REF
RAMP
STOP
A
1
A
0
C
H
C
H
= 5000 pF
Control input/output from
MPU
Temperature
Sensor
To other
Sensor
I
R
MB4053
1
R
REF
X
120 k
5000 pF
×
(5 V + 0.7 V)
150
μ
A - 25
μ
A
5000 pF
×
5 V
25
μ
A
8 V - 5 V
..
R
1
+ R
2
2
As shown in this example, the voltage output of the sensor is
proportional to V
CC
(Eq. 7-3) and V
REF
is also proportional to V
CC
(Eq. 7-1), the sensor output conversion results (Eq. 7-4) are not
influenced by power supply voltage fluctuation. Such a conversion
is called ratio metric conversion and is effective for minimizing the
effects of conversion error. Supply voltage fluctuations during
discharge do result in error, however.
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