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參數(shù)資料
| 型號： | IXR100 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Isolated, Self-Powered,Temperature Sensor Conditioning 4-20mA Two-Wire Transmitter(隔離的，自備電源的溫度傳感器4-20mA可兩線傳輸) |
| 中文描述： | 隔離，自供電，溫度傳感器調(diào)節(jié)的4 - 20mA雙線變送器（隔離的，自備電源的溫度傳感器的4 - 20mA可兩線傳輸） |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 157K |
| 代理商： | IXR100 |
IXR100
4
DC/DC CONVERTER
The DC/DC Converter transfers power from the 2 wire
current loop across the barrier to the circuitry used on the
input side of the isolation barrier.
PIN DESCRIPTIONS
I
REF1
, I
REF2
These pins provide a matched pair of current sources for
sensor excitation. These current sources provide excellent
thermal tracking, and when the linearization feature is used,
are modulated by an equal amount. Their nominal current
value is 0.4mA and their compliance voltage is:
V
IN
+
<
V
IREF
<
(Com
+ 7V)
+V
IN
, –V
IN
These are the inputs to both the input amplifier and the
linearization amplifier. Because the IXR100 has been
optimized for RTD applications, the two sets of inputs are
internally connected.
R
S1
,
R
S2
The resistor connected across these terminals determines the
gain of the IXR100. For normal 4-20mA outputs:
R
S
= 40
0.016/(
V
IN
) – 0.016
INPUT AMPLIFIER AND V/I CONVERTER
The Input Amplifier is an instrumentation amplifier whose
gain is set by R
S
, it drives the V/I Converter to produce a 4
to 20mA output current. The Input Amplifier has a common
mode voltage range of 2 to 4V with respect to COM (pin 5).
Normally this requirement is satisfied by returning the
currents from the RTD and zero balance resistor R
Z
to COM
through a common mode resistor R
CM
. For most applica-
tions a single value of 3.9k
may be used. When used with
RTDs having large values of resistance R
CM
must be chosen
so that the inputs of the amplifier remain within its rated
common mode range. R
CM
should be bypassed with a
0.01
μ
F or larger capacitor.
LINEARIZATION CIRCUIT
The Linearity Correction Circuit is unique in several ways.
A single external resistor will provide up to 50 times
improvement in the basic RTD linearity. Terminal based
non-linearity can be reduced to less than
±
0.1% for all RTD
temperature spans. The Linearization circuit also contains an
instrumentation amplifier internally connected to the
±
V
IN
pins. The gain of this stage is set by R
LIN
. The output
controls the excitation current sources to produce an increas-
ing excitation current as V
IN
increases. An important feature
is that the Linearity Correction is made directly to the RTD
output independent of the gain of the Input Amplifier. This
provides minimal interaction between R
S
and R
Z
. This
feature can be useful at the systems level by reducing data
acquisition system processor overhead previously used to
linearize sensor response in software/firmware.
FIGURE 1. Basic Connection for RTD.
R
Z
R
S
+V
IN
–
+
IXR100
R
CM
0.01μF
I = 4mA + (0.016 + R
V
IN
= I
REF
(RTD – R
Z
)
S
IN
RTD
R
LIN
R
L
–
+
(2)
NOTES: (1) R
Z
= RTD resistance at the minimum process temperature.
(2) R
S
= 0.016/(
.
V
IN
) – 0.016
(3) R
LIN
= 500
to 1500
or
∞
if linearization is not required.
0.4mA
0.4mA
R
O
4-20mA
Optional
Offset
Adjust
(1)
(3)
–V
IN
8
9
3
7
6
2
4
1
I
R
R
O
R
O
R
O
11
10
12
28
18
5
V
OUT
V
S
+I
R
Com
R
LIN
R
LIN
R
S
R
S
(1)
V
REF
2R
LIN
I
REF
= 400
μ
A +
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