XTR106 Datasheet, PDF (1/15 Pages) Burr-Brown (TI) – 4-20mA CURRENT TRANSMITTER with Bridge Excitation and Linearization

®
XTR106
XTR106
XTR106
4-20mA CURRENT TRANSMITTER
with Bridge Excitation and Linearization
FEATURES
q LOW TOTAL UNADJUSTED ERROR
q 2.5V, 5V BRIDGE EXCITATION REFERENCE
q 5.1V REGULATOR OUTPUT
q LOW SPAN DRIFT: ±25ppm/°C max
q LOW OFFSET DRIFT: 0.25µV/°C
q HIGH PSR: 110dB min
q HIGH CMR: 86dB min
q WIDE SUPPLY RANGE: 7.5V to 36V
q 14-PIN DIP AND SO-14 SURFACE-MOUNT
DESCRIPTION
The XTR106 is a low cost, monolithic 4-20mA, two-
wire current transmitter designed for bridge sensors. It
provides complete bridge excitation (2.5V or 5V refer-
ence), instrumentation amplifier, sensor linearization,
and current output circuitry. Current for powering ad-
ditional external input circuitry is available from the
V_REG pin.
The instrumentation amplifier can be used over a wide
range of gain, accommodating a variety of input signal
types and sensors. Total unadjusted error of the com-
plete current transmitter, including the linearized bridge,
is low enough to permit use without adjustment in many
applications. The XTR106 operates on loop power sup-
ply voltages down to 7.5V.
Linearization circuitry provides second-order correction
to the transfer function by controlling bridge excitation
voltage. It provides up to a 20:1 improvement in
nonlinearity, even with low cost transducers.
The XTR106 is available in 14-pin plastic DIP and
SO-14 surface-mount packages and is specified for the
–40°C to +85°C temperature range. Operation is from
–55°C to +125°C.
APPLICATIONS
q PRESSURE BRIDGE TRANSMITTER
q STRAIN GAGE TRANSMITTER
q TEMPERATURE BRIDGE TRANSMITTER
q INDUSTRIAL PROCESS CONTROL
q SCADA REMOTE DATA ACQUISITION
q REMOTE TRANSDUCERS
q WEIGHING SYSTEMS
q ACCELEROMETERS
BRIDGE NONLINEARITY CORRECTION
USING XTR106
2.0
Uncorrected
Bridge Output
1.5
1.0
0.5
Corrected
0
–0.5
0mV
5mV
Bridge Output
10mV
V_REF5
V_REG (5.1V)
V_REF 2.5V
R_LIN
+
7.5V to 36V
V_PS
4-20mA
5V
R_G
XTR106
V_O
R_L
–
I_RET
Lin
I_OUT
Polarity
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©_{1998 Burr-Brown Corporation}
PDS-1449A
Printed in U.S.A. June, 1998