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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)： | 3/14頁 |
| 文件大?。?/td> | 157K |
| 代理商： | IXR100 |
IXR100
3
PIN CONFIGURATION
DISCUSSION
OF PERFORMANCE
The IXR100 makes the design of isolated two wire 4 to
20mA transmitters easy and provides exceptional perfor-
mance at very low cost. It combines several unique features
not previously available in a single package. These include
galvanic isolation, sensor excitation and linearization, excel-
lent DC performance, and low zero and span drift. The
IXR100 functions with voltages as low as 11.6V at the
device. This allows operation with power supplies at or
below 15V. When used with the RCV420 the complete 4 to
20mA current loop requires only 13.1V. If series diode
protection is desired the minimum loop supply voltage is
still only about 13.7V. This is especially useful in systems
where the available supplies are only 15V.
BASIC CONNECTION
The basic connection of the IXR100 is shown in Figure 1. A
differential voltage applied between pins 2 and 3 will cause
a current of 4 to 20mA to circulate in the two wire output
loop pins 28 and 18. Pins 1 and 4 supply the current
excitation for resistive sensors. Pins 6 and 7 are provided for
the connection of an external span resistor which increases
the gain. Pins 8 and 9 provide linearity correction. Pins 10,
11 and 12 adjust the output offset current.
FUNCTIONAL DESCRIPTION
The IXR100 comprises of several functions:
Sensor excitation
Internal voltage regulator
Input amplifier and V/I converter
Linearization circuit
DC/DC Converter
SENSOR EXCITATION
Sensor Excitation consists of two matched 0.4mA current
sources. One is used to excite the resistive sensor and the
other is used to excite the zero balance resistor R
Z
. When the
linearity correction feature is used these current sources are
modulated together so that three wire operation of a Pt100
RTD is possible.
INTERNAL VOLTAGE REGULATOR
The circuitry within the IXR100 regulates the supply voltage
to the DC/DC Converter, Input Amplifier, Linearization
Amplifier and V/I Converter and removes the normal varia-
tions in V
S
from these stages as the output spans from 4 to
20mA.
I
REF1
V
IN+
V
IN–
I
REF2
Com
RS
1
RS
2
RL
1
RL
2
OS
1
OS
2
OS
3
*
*
+V
S
*
*
*
*
*
*
*
*
*
I
OUT
*
*
*
Top View
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
*
= No Pin
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