XTR
116
XTR
XTR115
XTR116
115
SBOS124A – JANUARY 2000 – REVISED NOVEMBER 2003
4-20mA CURRENT LOOP TRANSMITTERS
FEATURES
q
LOW QUIESCENT CURRENT: 200
µ
A
q
5V REGULATOR FOR EXTERNAL CIRCUITS
q
V
REF
FOR SENSOR EXCITATION:
XTR115: 2.5V
XTR116: 4.096V
q
LOW SPAN ERROR: 0.05%
q
LOW NONLINEARITY ERROR: 0.003%
q
WIDE LOOP SUPPLY RANGE: 7.5V to 36V
q
SO-8 PACKAGE
APPLICATIONS
q
2-WIRE, 4-20mA CURRENT LOOP
TRANSMITTER
q
SMART TRANSMITTER
q
INDUSTRIAL PROCESS CONTROL
q
TEST SYSTEMS
q
COMPATIBLE WITH HART MODEM
q
CURRENT AMPLIFIER
q
VOLTAGE-TO-CURRENT AMPLIFIER
DESCRIPTION
The XTR115 and XTR116 are precision current out-
put converters designed to transmit analog 4-to-20mA
signals over an industry standard current loop. They
provide accurate current scaling and output current
limit functions.
The on-chip voltage regulator (5V) can be used to
power external circuitry. A precision on-chip V
REF
(2.5V for XTR115 and 4.096V for XTR116) can be
XTR115
XTR116
+5V
V
REG
8
V
REF
1
Voltage
Reference
+5V
Regulator
used for offsetting or to excite transducers. A current
return pin (I
RET
) senses any current used in external
circuitry to assure an accurate control of the output
current.
The XTR115 is a fundamental building block of
smart sensors using 4-to-20mA current transmission.
The XTR115 and XTR116 are specified for opera-
tion over the extended industrial temperature range,
–40°C to +85°C.
V+
7
XTR115: 2.5V
XTR116: 4.096V
V
LOOP
R
IN
+
V
IN
–
3
I
RET
R
1
2.475kΩ
R
LIM
R
2
25Ω
I
O
=
4
I = 100 • I
IN
100 V
IN
R
IN
I
IN
2
A1
E
5
B
6
R
L
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000-2003, Texas Instruments Incorporated
www.ti.com
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