XTR105_15 Datasheet, PDF (1/23 Pages) Texas Instruments – 4-20mA CURRENT TRANSMITTER with Sensor Excitation and Linearization

XTR105
XTR105
XTR105
SBOS061B – FEBRUARY 1997 – REVISED AUGUST 2004
4-20mA CURRENT TRANSMITTER
with Sensor Excitation and Linearization
FEATURES
q LOW UNADJUSTED ERROR
q TWO PRECISION CURRENT SOURCES: 800µA each
q LINEARIZATION
q 2- OR 3-WIRE RTD OPERATION
q LOW OFFSET DRIFT: 0.4µV/°C
q LOW OUTPUT CURRENT NOISE: 30nA_PP
q HIGH PSR: 110dB minimum
q HIGH CMR: 86dB minimum
q WIDE SUPPLY RANGE: 7.5V to 36V
q DIP-14 AND SO-14 PACKAGES
DESCRIPTION
The XTR105 is a monolithic 4-20mA, 2-wire current transmit-
ter with two precision current sources. It provides complete
current excitation for platinum RTD temperature sensors and
bridges, instrumentation amplifiers, and current output cir-
cuitry on a single integrated circuit.
Versatile linearization circuitry provides a 2nd-order correc-
tion 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 un-
adjusted error of the complete current transmitter is low
enough to permit use without adjustment in many applica-
tions. This includes zero output current drift, span drift, and
nonlinearity. The XTR105 operates on loop power-supply
voltages down to 7.5V.
The XTR105 is available in DIP-14 and SO-14 surface-
mount packages and is specified for the –40°C to +85°C
industrial temperature range.
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q FACTORY AUTOMATION
q SCADA REMOTE DATA ACQUISITION
q REMOTE TEMPERATURE AND PRESSURE
TRANSDUCERS
5
4
3
2
1
0
−1
−200°C
Pt100 NONLINEARITY CORRECTION
USING XTR105
Uncorrected
RTD Nonlinearity
Corrected
Nonlinearity
Process Temperature (°C)
+850°C
I_R = 0.8mA
I_R = 0.8mA
+
V_LIN
V_REG
RTD
R_G
XTR105
–
7.5V to 36V
V_PS
4-20 mA
V_O
R_L
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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