®
XTR
XTR
114
112
XTR112
XTR114
4-20mA CURRENT TRANSMITTERS
with Sensor Excitation and Linearization
FEATURES
q
LOW UNADJUSTED ERROR
q
PRECISION CURRENT SOURCES
XTR112: Two 250
µ
A
XTR114: Two 100
µ
A
q
RTD OR BRIDGE EXCITATION
q
LINEARIZATION
q
TWO OR THREE-WIRE RTD OPERATION
q
q
q
q
q
q
LOW OFFSET DRIFT: 0.4
µ
V/
°
C
LOW OUTPUT CURRENT NOISE: 30nAp-p
HIGH PSR: 110dB min
HIGH CMR: 86dB min
WIDE SUPPLY RANGE: 7.5V TO 36V
SO-14 SOIC PACKAGE
Pt1000 NONLINEARITY CORRECTION
USING XTR112 and XTR114
5
4
Nonlinearity (%)
3
2
1
0
–1
–200°C
Process Temperature (°C)
+850°C
APPLICATIONS
q
INDUSTRIAL PROCESS CONTROL
q
FACTORY AUTOMATION
q
SCADA REMOTE DATA ACQUISITION
q
REMOTE TEMPERATURE AND PRESSURE
TRANSDUCERS
Uncorrected
RTD Nonlinearity
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.
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
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-1473A
1
Printed in U.S.A. December, 1998
XTR112, XTR114
BURR-BROWN [ BURR-BROWN CORPORATION ]
