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參數(shù)資料
| 型號(hào)： | MAX1459 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | 2線、4-20mA智能信號(hào)調(diào)理器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | MAX1459 |
test pressures (e.g., zero and full scale) at two arbitrary
test temperatures, T
1
and T
2
. Ideally, T
1
and T
2
are the
two points where we wish to perform best linear fit com-
pensation. The following outlines a typical compensa-
tion procedure:
1) Perform coefficient initialization.
2) Perform FSO calibration.
3) Perform FSOTC compensation.
4) Perform offset TC compensation.
5) Perform offset calibration.
Coefficient Initialization
Select the resistor values and the PGA gain to prevent
overload of the PGA and bridge current source.
Determine whether the MAX1459’s internal resistors are
suitable or external resistors are necessary. These val-
ues depend on sensor behavior and require some sen-
sor characterization data, which may be available from
the sensor manufacturer. If not, the data can be gener-
ated by performing a two-temperature, two-pressure
sensor evaluation. The required sensor information is
shown in Table 8 and can be used to obtain the values
for the parameters listed in Table 9.
Selecting R
ISRC
When using an external resistor, use the equation below
to determine the value of R
ISRC
, and place the resistor
between ISRC and V
SS
. Since the 12-bit FSO DAC pro-
vides considerable dynamic range, the R
ISRC
value
need not be exact. Generally, any resistor value within
±50% of the calculated value is acceptable. If both the
internal resistors R
ISRC
and R
FTC
are used, set the IRS
bit at EEPROM address bit 07 hex low.
M
2-Wire, 4–20mA
Smart Signal Conditioner
______________________________________________________________________________________
15
-20
-10
10
0
20
30
-50
0
50
100
150
UNCOMPENSATED SENSOR ERROR
TEMPERATURE (
°
C)
E
OFFSET
FSO
-0.8
-0.6
0.4
-0.2
-0.4
0
0.2
0.6
0.8
-50
0
50
100
150
COMPENSATION TRANSDUCER ERROR
TEMPERATURE
°
(C)
E
OFFSET
FSO
Figure 12. Comparison of an Uncalibrated Sensor and a Temperature-Compensated Transducer
Table 7. MAX1459 Calibration and Compensation
TYPICAL UNCOMPENSATED INPUT (SENSOR)
0.7% FSO
-40°C to +125°C
Temperature Range
0.5% FSO
FSO TC Nonlinearity
-35% FSO
FSO TC
Offset TC Nonlinearity
-17% FSO
Offset TC
+15mV/V
FSO
±80% FSO
Offset
DESCRIPTION
NAME
±20mV (±0.5% FSO)
FSO Accuracy Over Temp
Range
±28mV (±0.7% FSO)
Offset Accuracy Over Temp
Range
4.000V ±5mV
FSO at +25°C
0.500V ±5mV
Offset at +25°C
Ratiometric to V
DD
at 5.0V
DESCRIPTION
NAME
V
OUT
TYPICAL COMPENSATED TRANSDUCER OUTPUT
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