®
XTR
106
XTR106
XTR
106
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: 0.25
µ
V/
°
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
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
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.
Nonlinearity (%)
1.0
0.5
Corrected
0
–0.5
0mV
5mV
Bridge Output
10mV
V
REG
(5.1V)
V
REF
5
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
Polarity
I
OUT
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1998 Burr-Brown Corporation
PDS-1449A
Printed in U.S.A. June, 1998
BURR-BROWN [ BURR-BROWN CORPORATION ]
