XTR108_12 Datasheet, PDF (1/32 Pages) Burr-Brown (TI) – 4-20mA, TWO-WIRE TRANSMITTER “Smart” Programmable with Signal Conditioning

XTR108
XTR108
SBOS187C – OCTOBER 2001 – REVISED JULY 2005
4-20mA, TWO-WIRE TRANSMITTER
“Smart” Programmable with Signal Conditioning
FEATURES
q COMPLETE TRANSMITTER + RTD
LINEARIZATION
q TWO-WIRE, 4-20mA OUTPUT
q VOLTAGE OUTPUT (0.5V to 4.5V)
q ELIMINATES POTENTIOMETERS AND
TRIMMING
q DIGITALLY CALIBRATED
q 5V SUB-REGULATOR OUTPUT
q SERIAL SPI^ BUS INTERFACE
q SSOP-24 PACKAGE
APPLICATIONS
q REMOTE RTD TRANSMITTERS
q PRESSURE BRIDGE TRANSMITTERS
q STRAIN GAGE TRANSMITTERS
q SCADA REMOTE DATA ACQUISITION
q WEIGHING SYSTEMS
q INDUSTRIAL PROCESS CONTROL
DESCRIPTION
The XTR108 is a “smart,” programmable, 4-20mA, two-wire
transmitter designed for temperature and bridge sensors.
Zero, span, and linearization errors in the analog signal
path can be calibrated via a standard digital serial interface,
eliminating manual trimming. Non-volatile external EEPROM
stores calibration settings.
The all-analog signal path contains an input multiplexer,
autozeroed programmable-gain instrumentation amplifier, dual
programmable current sources, linearization circuit, voltage
reference, sub-regulator, internal oscillator, control logic, and
an output current amplifier. Programmable level shifting
compensates for sensor DC offsets. Selectable
up- and down-scale output indicates out-of-range and burn-
out per NAMUR NE43. Automatic reset is initiated when
supply is lost.
Current sources, steered through the multiplexer, can be
used to directly excite RTD temperature sensors, pressure
bridges, or other transducers. An uncommitted op amp can
be used to convert current into a voltage. The XTR108 is
specified for –40°C to +85°C.
EEPROM
RTD
V/I-0
V/I-1
V/I-2
V/I-3
V/I-4
V/I-5
R1 R2 R3 R4 R5
Excitation
SPI and
Control Circuits
Linearization
PGA
IO
V/I
XTR108
I_Ret
V_PS
4-20mA
RLOAD
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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.
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