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參數(shù)資料
| 型號： | IXR100 |
| 英文描述： | IXR100 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | IXR100 -已停產(chǎn)產(chǎn)品。不再推薦用于新設(shè)計。 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 138K |
| 代理商： | IXR100 |
IXR100
10
OTHER APPLICATIONS
In instances where the linearization capability of the IXR100
is not required, it can still provide improved performance in
several applications. Its small size, wide compliance
voltage, low zero and span drift, high PSRR, high CMRR
and excellent linearity makes the IXR100 ideal for a variety
of other isolated two-wire transmitter applications. It can be
used by OEMs producing different types of isolated trans-
ducer transmitter modules and by data acquisition systems
manufacturers who gather transducer data. Current mode
transmission greatly reduces noise interference. The two-
wire nature of the device allows economical signal condi-
tioning at the transducer. Thus, the IXR100 is, in general,
very suitable for a wide variety of applications. Some
examples, including an isolated non-linearized Pt100 case,
follow.
EXAMPLE 1
Pt100 RTD without linearization shown in Figure 9.
Given a process with temperature limits of +25
°
C and
+150
°
C, configure the IXR100 to measure the temperature
with a Pt100 RTD which produces 109.73
at 25
°
C and
157.31
at 150
°
C (obtained from standard RTD tables).
Transmit 4mA for +25
°
C and 20mA for +150
°
C. The
change in resistance of the RTD is 47.6
. When excited
with a 0.4mA current source
V
IN
is 0.4mA
x
47.6
=
19mV.
0.016/(
V
IN
) – 0.016
FIGURE 8. Basic 3-Wire RTD Connection for Increase-Decrease Action.
R
S
= 40
(1)
From Equation (1), R
S
= 48.5
. Span adjustment (calibra-
tion) is accomplished by trimming R
S
.
In order to make the lower range limit of 25
°
C correspond
to the output lower range limit at 4mA, the input circuitry
shown in Figure 9 is used. V
IN
must be 0V at 25
°
C and R
Z
is chosen to be equal to the RTD resistance at 25
°
C, or
109.73
. Computing R
CM
and checking CMV:
At +25
°
C, V
IN+
= 43.9mV
At +150
°
C, V
IN+
= 62.9mV
Since both V
IN+
and V
Z
are small relative to the desired 2V
common-mode voltage, they may be ignored in computing
R
CM
as long as the CMV is met.
R
CM
= 3V/0.8mA = 3.75k
V
IN+
min = 3V + 0.0439V
V
IN+
max = 3V + 0.0629V
V
IN–
= 3V + 0.0439V
EXAMPLE 2
Thermocouple shown in Figure 10.
Given a process with temperature (T
l
) limits of 0
°
C and
+1000
°
C, configure the IXR100 to measure the temperature
with a Type J thermocouple that produces a 58mV change
for 1000
°
C change. Use a semiconductor diode for a cold
junction compensation to make the measurement relative to
0
°
C. This is accomplished by supplying a compensating
voltage, equal to that normally produced by the thermo-
couple with its “cold junction” (T
2
) at ambient. At +25
°
C
this is 1.28mV (from thermocouple tables with reference
junction at 0
°
C). Typically, at T
2
= +25
°
C, V
D
= 0.6V and
+
–
3
7
6
2
R
S
V
IN
+
–
IXR100
R = 3.9k
0.4mA
0.01μF
0.4mA
1
Three-wire Connection
RTD
1
3
2
R
Z
9
8
R
LIN
D
1N4148
5
R
L
–
+
V
OUT
+V
S
4-20mA
4
1
28
18
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