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參數(shù)資料
| 型號： | 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智能信號調(diào)理器 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | MAX1459 |
First, calculate the ideal IRO correction voltage using
the following formula, and select the nearest setting
from Table 1:
where IROideal is the exact voltage required to perfect-
ly null the sensor, O(T1) is the sensor offset voltage in
V/V at +25°C, and V
BDRIVE
(T1) is the nominal sensor
excitation voltage at +25°C. In this example, 30mV
must be subtracted from the amplifier front end to null
the sensor perfectly. From Table 1, select an IRO value
of 3 to set the IRO DAC to 27mV, which is nearest the
ideal value. To subtract this value, set the IRO sign bit
to 0. The residual output-referred offset error will be
corrected later with the offset DAC.
Determining OFFTC COEF Initial Value
Generally, OFFTC COEF can initially be set to 0 since
the offset TC error will be compensated in a later step.
However, sensors with large offset TC errors may
require an initial coarse offset TC adjustment to prevent
the PGA from saturating during the compensation pro-
cedure as temperature is increased. An initial coarse
offset TC adjustment is required for sensors with an off-
set TC greater than about 10% of the FSO. If an initial
coarse offset TC adjustment is required, use the follow-
ing equation:
OFFTC COEF
4096 x
V
BDRIVE
T
( )
x
4096 OTC FSO
TCS x
4096 -1000ppm/ C 4V
-2100ppm/ C 2.5V 2.3
2.3 x T
x
OUT
BDRIVE
=
( )
)
)
x
x
x
x
x
x
T
1357
IROideal
- O T1 V
T1
( )
- 0.012V/V 2.5V
-30mV
BDRIVE
=
]
=
=
x
x
M
2-Wire, 4–20mA
Smart Signal Conditioner
______________________________________________________________________________________
17
MAX1459
1
1
C
1
C
O
(
1
FSOTC
R
NBIAS
= 402k
1%
A = 1
V
SS
+5V
OUT
V
DD
DIGITAL
INTERFACE
PGA
CS
WE
SCLK
DIO
BDRIVE
INM
ISRC
INP
C2
0.1
μ
F
C1
0.1
μ
F
V
SS
R
ISRC
R
FTC
R
ISRC
R
FTC
128-BIT
EEPROM
V
DD
Σ
SENSOR
SELECT
OUTPUT
AMPOUT
AMP-
AMP+
R
T
TEMP1
TEMP2
TEMPIN
NBIAS
Figure 13. Basic Ratiometric Output Configuration
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