XTR104 Datasheet, PDF (1/12 Pages) Burr-Brown (TI) – 4-20mA Current Transmitter with BRIDGE EXCITATION AND LINEARIZATION

®
XTR104
SBOS018
4-20mA Current Transmitter with
BRIDGE EXCITATION AND LINEARIZATION
FEATURES
q LESS THAN ±1% TOTAL ADJUSTED
ERROR, –40°C TO +85°C
q BRIDGE EXCITATION AND LINEARIZATION
q WIDE SUPPLY RANGE: 9V to 40V
q LOW SPAN DRIFT: 50ppm/°C max
q HIGH PSR: 110dB min
q HIGH CMR: 80dB min
DESCRIPTION
The XTR104 is a monolithic 4-20mA, two-wire cur-
rent transmitter integrated circuit designed for bridge
input signals. It provides complete bridge excitation,
instrumentation amplifier, linearization, and current
output circuitry necessary for high impedance strain
gage sensors.
The instrumentation amplifier can be used over a wide
range of gain, accommodating a variety of input signals
and sensors. Total adjusted error of the complete current
transmitter, including the linearized bridge is less than
±1% over the full –40°C to +85°C temperature range.
This includes zero drift, span drift and non-linearity for
bridge outputs as low as 10mV. The XTR104 operates
on loop power supply voltages down to 9V.
Linearization circuitry consists of a second, fully inde-
pendent instrumentation amplifier that controls the bridge
excitation voltage. It provides second-order correction
to the transfer function, typically achieving a 20:1
improvement in nonlinearity, even with low cost trans-
ducers.
The XTR104 is available in 16-pin plastic DIP and
SOL-16 surface-mount packages specified for the
–40°C to +85°C temperature range.
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q FACTORY AUTOMATION
q SCADA
q WEIGHTING SYSTEMS
q ACCELEROMETERS
BRIDGE NONLINEARITY CORRECTION
USING XTR104
2.0
Uncorrected
Bridge Output
1.5
1.0
0.5
0
–0.5
0mV
Corrected
5mV
Bridge Output
10mV
R _LIN
+
9V to 40V
V_PS
R_G
XTR104
–
4-20 mA
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: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1992 Burr-Brown Corporation}
PDS₁-1146B
®
XTR104 ^{Printed in U.S.A. September, 1993}