XTR112 Datasheet, PDF (1/18 Pages) Burr-Brown (TI) – 4-20mA CURRENT TRANSMITTERS with Sensor Excitation and Linearization

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XTR114
XTR112
XTR112
XTR114
SBOS101
4-20mA CURRENT TRANSMITTERS
with Sensor Excitation and Linearization
FEATURES
q LOW UNADJUSTED ERROR
q PRECISION CURRENT SOURCES
XTR112: Two 250µA
XTR114: Two 100µA
q RTD OR BRIDGE EXCITATION
q LINEARIZATION
q TWO OR THREE-WIRE RTD OPERATION
q LOW OFFSET DRIFT: 0.4µV/°C
q LOW OUTPUT CURRENT NOISE: 30nAp-p
q HIGH PSR: 110dB min
q HIGH CMR: 86dB min
q WIDE SUPPLY RANGE: 7.5V TO 36V
q SO-14 SOIC PACKAGE
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q FACTORY AUTOMATION
q SCADA REMOTE DATA ACQUISITION
q REMOTE TEMPERATURE AND PRESSURE
TRANSDUCERS
Pt1000 NONLINEARITY CORRECTION
USING XTR112 and XTR114
5
4
3
Uncorrected
RTD Nonlinearity
2
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.
1
0
–1
–200°C
Corrected
Nonlinearity
Process Temperature (°C)
+850°C
RTD
I_R
I_R
V_LIN
V_REG
+
XTR112
R_G
XTR114
–
7.5V to 36V
V_PS
4-20 mA
V_O
R_L
XTR112: I_R = 250µA
XTR114: I_R = 100µA
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1998 Burr-Brown Corporation}
PDS-11473A
®
XTR112^Pr,^intX^edTⁱⁿR^U.1^S.A1^. 4^{December, 1998}