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參數(shù)資料
| 型號： | ADC9708CMJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 6-Channel 8-Bit uP Compatible A/D Converter |
| 中文描述： | 6-CH 8-BIT SINGLE-SLOPE ADC, SERIAL ACCESS, CDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 175K |
| 代理商： | ADC9708CMJ |
Typical Applications
(Continued)
3. The auto-zero/auto-full-scale (See Figures 5–8) should
use double precision, rounded (as opposed to truncated)
arithmatic. Several points are worth noting:
a. The subtractions are single op code instructions.
b. The full scale correction uses a multiply by 256 and
can be accomplished by a shift left 8 bits (usually one
instruction) or placing (N
b
N
Z
) in the MSB register
and setting the LSB register to zero, for the double
precision divide.
c. The divisor (N
F.S.
b
N
Z
) of the MSB register will al-
ways be zero.
These schemes have the following advantages:
a. No access to the data bus or address bus is required,
by the A/D system.
b. 5 I/O bits completely support the A/D system.
c. Since auto full scale/auto zero are implemented in
software and long term drift (aging) effects are elimi-
nated.
d. Software overhead is minimal (typically 30 bytes).
e. Where ratiometric operation is permissible, the 4 exter-
nal components may be
g
5% tolerance, including the
power supply.
TL/H/10409–11
Note:
D
V
I
e
(Applied Force) and can be Linearized (if necessary) in Software.
FIGURE 9. Ratiometric Strain Gage Sensore/Controller
TL/H/10409–12
Applications
Beverage Brewers/Dispensers
Chemical Solution Control
Automatic Liquid Mixing Control
Ramp Current
e
I
R
e
V
CC
a
#
R
1
R
1
a
R
2
J #
1
R
3
J
V
I
e
#
R
X
R
X
a
R
B
J
V
CC
a
Ramp Time
e
V
I
#
C
H
I
R
J
e
#
R
X
R
X
a
R
B
J #
1
a
R
2
R
1
J #
C
H
R
3
J
FIGURE 10
6
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