two-wire current transmitters. They provide complete
current excitation for high impedance platinum RTD
temperature sensors and bridges, instrumentation am-
plifier, and current output circuitry on a single inte-
grated circuit. The XTR112 has two 250µA current
sources while the XTR114 has two 100µA sources for
RTD excitation.
Versatile linearization circuitry provides a 2nd-order
correction to the RTD, typically achieving a 40:1
improvement in linearity.
Instrumentation amplifier gain can be configured for a
wide range of temperature or pressure measurements.
Total unadjusted error of the complete current trans-
mitter is low enough to permit use without adjustment
in many applications. This includes zero output cur-
rent drift, span drift and nonlinearity. The XTR112
and XTR114 operate on loop power supply voltages
down to 7.5V.
Both are available in an SO-14 surface-mount pack-
age and are specified for the –40°C to +85°C indus-
trial temperature range.
Corrected
Nonlinearity
I
R
I
R
V
LIN
V
REG
+
7.5V to 36V
V
PS
4-20 mA
R
G
RTD
–
XTR112:
I
R
= 250µA
XTR114:
I
R
= 100µA
XTR112
XTR114
V
O
R
L
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
NOTES: (1) Describes accuracy of the 4mA low-scale offset current. Does not include input amplifier effects. Can be trimmed to zero. (2) Voltage measured with
respect to I
RET
pin. (3) Does not include initial error or TCR of gain-setting resistor, R
G
. (4) Increasing the full-scale input range improves nonlinearity. (5) Does not
include Zero Output initial error. (6) Current source output voltage with respect to I
Storage Temperature Range ....................................... –55°C to +125°C
Lead Temperature (soldering, 10s) .............................................. +300°C
Output Current Limit ............................................................... Continuous
Junction Temperature ................................................................... +165°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
1
2
3
4
5
6
7
14 I
R2
13 V
IN
12 V
LIN
11 V
REG
10 V+
9
8
B (Base)
E (Emitter)
+
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
NC = No Connection
PACKAGE/ORDERING INFORMATION
CURRENT
SOURCES
2 x 250µA
"
2 x 250µA
"
2 x 100µA
"
2 x 100µA
"
PACKAGE
DRAWING
NUMBER
(1)
235
"
235
"
235
"
235
"
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
"
–40°C to +85°C
"
–40°C to +85°C
"
–40°C to +85°C
"
ORDERING
NUMBER
(2)
XTR112U
XTR112U/2K5
XTR112UA
XTR112UA/2K5
XTR114U
XTR114U/2K5
XTR114UA
XTR114UA/2K5
TRANSPORT
MEDIA
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
Rails
Tape and Reel
PRODUCT
XTR112U
"
XTR112UA
"
XTR114U
"
XTR114UA
"
PACKAGE
SO-14 Surface Mount
"
SO-14 Surface Mount
"
SO-14 Surface Mount
"
SO-14 Surface Mount
"
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Models with a slash (/) are
available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “XTR112UA/2K5” will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use
of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits
described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
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