XTR106
XTR106
X
TR
1
06
SBOS092A – JUNE 1998 – REVISED NOVEMBER 2003
4-20mA CURRENT TRANSMITTER
with Bridge Excitation and Linearization
FEATURES
APPLICATIONS
ꢀ LOW TOTAL UNADJUSTED ERROR
ꢀ 2.5V, 5V BRIDGE EXCITATION REFERENCE
ꢀ 5.1V REGULATOR OUTPUT
ꢀ PRESSURE BRIDGE TRANSMITTERS
ꢀ STRAIN GAGE TRANSMITTERS
ꢀ TEMPERATURE BRIDGE TRANSMITTERS
ꢀ INDUSTRIAL PROCESS CONTROL
ꢀ SCADA REMOTE DATA ACQUISITION
ꢀ REMOTE TRANSDUCERS
ꢀ LOW SPAN DRIFT: ±25ppm/°C max
ꢀ LOW OFFSET DRIFT: 0.25µV/°C
ꢀ HIGH PSR: 110dB min
ꢀ HIGH CMR: 86dB min
ꢀ WEIGHING SYSTEMS
ꢀ WIDE SUPPLY RANGE: 7.5V to 36V
ꢀ 14-PIN DIP AND SO-14 SURFACE-MOUNT
ꢀ ACCELEROMETERS
BRIDGE NONLINEARITY CORRECTION
USING XTR106
2.0
DESCRIPTION
Uncorrected
Bridge Output
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
VREG pin.
1.5
1.0
0.5
Corrected
0
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.
–0.5
0
5
10
Bridge Output (mV)
V
REG (5.1V)
VREF 2.5V
VREF
5
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.
RLIN
+
7.5V to 36V
VPS
4-20mA
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.
5V
VO
XTR106
RG
RL
–
IOUT
Lin
Polarity
IRET
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PRODUCTION DATA information is current as of publication date.
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