®
XTR104
4-20mA Current Transmitter with
BRIDGE EXCITATION AND LINEARIZATION
FEATURES
APPLICATIONS
● LESS THAN ±1% TOTAL ADJUSTED
● INDUSTRIAL PROCESS CONTROL
● FACTORY AUTOMATION
● SCADA
ERROR, –40°C TO +85°C
● BRIDGE EXCITATION AND LINEARIZATION
● WIDE SUPPLY RANGE: 9V to 40V
● LOW SPAN DRIFT: 50ppm/°C max
● HIGH PSR: 110dB min
● WEIGHTING SYSTEMS
● ACCELEROMETERS
● HIGH CMR: 80dB min
BRIDGE NONLINEARITY CORRECTION
USING XTR104
2.0
Uncorrected
Bridge Output
DESCRIPTION
1.5
1.0
0.5
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.
Corrected
0
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.
–0.5
0mV
5mV
Bridge Output
10mV
RLIN
9V to 40V
+
VPS
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.
4-20 mA
XTR104
RG
VO
RL
–
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.
International Airport Industrial Park
•
Mailing Address: PO Box 11400
Cable: BBRCORP
•
Tucson, AZ 85734
•
Street Address: 6730 S. Tucson Blvd.
• Tucson, AZ 85706
Tel: (520)746-1111 Twx: 910-952-1111
•
•
•
Telex: 066-6491
•
FAX: (520)889-1510
•
Immediate Product Info: (800)548-6132
®
©1992 Burr-Brown Corporation
PDS-1146B
PrXinteTd Rin U1.S0.A4. September, 1993
1