®
XTR114
XTR112
XTR114
XTR112
4-20mA CURRENT TRANSMITTERS
with Sensor Excitation and Linearization
FEATURES
APPLICATIONS
● LOW UNADJUSTED ERROR
● INDUSTRIAL PROCESS CONTROL
● PRECISION CURRENT SOURCES
XTR112: Two 250µA
● FACTORY AUTOMATION
● SCADA REMOTE DATA ACQUISITION
XTR114: Two 100µA
● REMOTE TEMPERATURE AND PRESSURE
● RTD OR BRIDGE EXCITATION
● LINEARIZATION
TRANSDUCERS
● TWO OR THREE-WIRE RTD OPERATION
● LOW OFFSET DRIFT: 0.4µV/°C
● LOW OUTPUT CURRENT NOISE: 30nAp-p
● HIGH PSR: 110dB min
Pt1000 NONLINEARITY CORRECTION
USING XTR112 and XTR114
5
4
● HIGH CMR: 86dB min
3
● WIDE SUPPLY RANGE: 7.5V TO 36V
● SO-14 SOIC PACKAGE
Uncorrected
RTD Nonlinearity
2
Corrected
Nonlinearity
1
0
DESCRIPTION
The XTR112 and XTR114 are monolithic 4-20mA,
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.
–1
–200°C
+850°C
Process Temperature (°C)
IR
IR
VLIN
VREG
Versatile linearization circuitry provides a 2nd-order
correction to the RTD, typically achieving a 40:1
improvement in linearity.
7.5V to 36V
VPS
+
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.
4-20 mA
XTR112
XTR114
VO
RL
RG
RTD
–
XTR112: IR = 250µA
XTR114: IR = 100µA
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.
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
Twx: 910-952-1111 Internet: http://www.burr-brown.com/
•
•
Cable: BBRCORP Telex: 066-6491
•
•
FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
•
®
©1998 Burr-Brown Corporation
PDS-11473A
Printed in U.S.A. December, 1998
XTR112, XTR114
SBOS101