XTR115
XTR116
XTR116
XTR115
SBOS124A – JANUARY 2000 – REVISED NOVEMBER 2003
4-20mA CURRENT LOOP TRANSMITTERS
FEATURES
APPLICATIONS
ꢀ LOW QUIESCENT CURRENT: 200µA
ꢀ 5V REGULATOR FOR EXTERNAL CIRCUITS
ꢀ VREF FOR SENSOR EXCITATION:
ꢀ 2-WIRE, 4-20mA CURRENT LOOP
TRANSMITTER
ꢀ SMART TRANSMITTER
ꢀ INDUSTRIAL PROCESS CONTROL
ꢀ TEST SYSTEMS
XTR115: 2.5V
XTR116: 4.096V
ꢀ LOW SPAN ERROR: 0.05%
ꢀ COMPATIBLE WITH HART MODEM
ꢀ CURRENT AMPLIFIER
ꢀ LOW NONLINEARITY ERROR: 0.003%
ꢀ WIDE LOOP SUPPLY RANGE: 7.5V to 36V
ꢀ SO-8 PACKAGE
ꢀ VOLTAGE-TO-CURRENT AMPLIFIER
used for offsetting or to excite transducers. A current
return pin (IRET) senses any current used in external
circuitry to assure an accurate control of the output
current.
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 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.
The on-chip voltage regulator (5V) can be used to
power external circuitry. A precision on-chip VREF
(2.5V for XTR115 and 4.096V for XTR116) can be
XTR115
XTR116
VREG
+5V
Regulator
V+
7
+5V
8
VREF
1
Voltage
Reference
XTR115: 2.5V
XTR116: 4.096V
VLOOP
B
6
RIN
IIN
2
RL
A1
+
E
5
VIN
–
RLIM
3
IRET
100 VIN
R1
2.475kΩ
R2
25Ω
IO
=
RIN
4
I = 100 • IIN
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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.
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