®
XTR
105
XTR105
XTR
105
www.burr-brown.com/databook/XTR105.html
4-20mA CURRENT TRANSMITTER
with Sensor Excitation and Linearization
FEATURES
q
LOW UNADJUSTED ERROR
q
TWO PRECISION CURRENT SOURCES
800
µ
A EACH
q
RTD OR BRIDGE EXCITATION
q
LINEARIZATION
q
TWO OR THREE-WIRE RTD OPERATION
q
LOW OFFSET DRIFT: 0.4
µ
V/
°
C
q
LOW OUTPUT CURRENT NOISE: 30nAp-p
q
HIGH PSR: 110dB min
Nonlinearity (%)
5
4
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
Pt100 NONLINEARITY CORRECTION
USING XTR105
q
HIGH CMR: 86dB min
q
WIDE SUPPLY RANGE: 7.5V TO 36V
q
14-PIN DIP AND SO-14 SOIC PACKAGES
Uncorrected
RTD Nonlinearity
DESCRIPTION
The XTR105 is a monolithic 4-20mA, two-wire
current transmitter with two precision current sources.
It provides complete current excitation for Platinum
RTD temperature sensors and bridges, instrumenta-
tion amplifier, and current output circuitry on a single
integrated circuit.
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 XTR105
operates on loop power supply voltages down to 7.5V.
The XTR105 is available in 14-pin plastic DIP and
SO-14 surface-mount packages and is specified for the
–40°C to +85°C industrial temperature range.
Corrected
Nonlinearity
I
R
= 0.8mA
I
R
= 0.8mA
V
LIN
V
REG
+
7.5V to 36V
V
PS
4-20 mA
R
G
RTD
–
XTR105
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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
©
1997 Burr-Brown Corporation
PDS-1362B
1
Printed in U.S.A. February, 1997
XTR105
BURR-BROWN [ BURR-BROWN CORPORATION ]
