XTR101
SBOS146A − OCTOBER 1986 − REVISED AUGUST 2004
Precision, Low Drift
4-20mA TWO-WIRE TRANSMITTER
FEATURES
D
INSTRUMENTATION AMPLIFIER INPUT:
− Low Offset Voltage, 30µV max
− Low Voltage Drift, 0.75µV/°C max
− Low Nonlinearity, 0.01% max
DESCRIPTION
The XTR101 is a microcircuit, 4-20mA, two-wire
transmitter containing a high accuracy instrumentation
amplifier (IA), a voltage-controlled output current source,
and dual-matched precision current reference. This
combination is ideally suited for remote signal conditioning
of a wide variety of transducers such as thermocouples,
RTDs, thermistors, and strain gauge bridges. State-of-the-
art design and laser-trimming, wide temperature range
operation, and small size make it very suitable for
industrial process control applications. In addition, the
optional external transistor allows even higher precision.
The two-wire transmitter allows signal and power to be
supplied on a single wire pair by modulating the
power-supply current with the input signal source. The
transmitter is immune to voltage drops from long runs and
noise from motors, relays, actuators, switches,
transformers, and industrial equipment. It can be used by
OEMs producing transmitter modules or by data
acquisition system manufacturers.
I
REF1
I
REF2
10
e
1
3
−
11
+V
CC
8
Optional
External
Transistor
D
TRUE TWO-WIRE OPERATION:
− Power and Signal on One Wire Pair
− Current Mode Signal Transmission
− High Noise Immunity
D
D
D
D
DUAL MATCHED CURRENT SOURCES
WIDE SUPPLY RANGE: 11.6V to 40V
SPECIFICATION RANGE: −40°C to +85°C
SMALL DIP-14 PACKAGE, CERAMIC AND
PLASTIC
APPLICATIONS
D
INDUSTRIAL PROCESS CONTROL:
− Pressure Transmitters
− Temperature Transmitters
− Millivolt Transmitters
D
D
D
D
D
D
D
RESISTANCE BRIDGE INPUTS
THERMOCOUPLE INPUTS
RTD INPUTS
CURRENT SHUNT (mV) INPUTS
PRECISION DUAL CURRENT SOURCES
AUTOMATED MANUFACTURING
POWER/PLANT ENERGY SYSTEM
MONITORING
e
2
4
+
13
(1)
1
2
14 7
Span
6
XTR101
5
12
(1)
B
9
E
I
OUT
Optional
Offset Null
NOTE: (1) Pins 12 and 13 are used for optional BW control.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
1986-2004, Texas Instruments Incorporated
www.ti.com
TI [ TEXAS INSTRUMENTS ]
