XTR108 TRANSMITTER Datasheet

XTR108 Datasheet, PDF, Equivalent


Part Number

XTR108

Description

TWO-WIRE TRANSMITTER

Manufacture

Burr-Brown Corporation

Total Page 30 Pages
Datasheet
Download XTR108 Datasheet


XTR108
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 SPIBUS 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
IRet
VPS
4-20mA
RLOAD
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.
SPI is a trademark of Motorola, Inc. All other 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.
www.ti.com
Copyright © 2001-2005, Texas Instruments Incorporated

XTR108
ABSOLUTE MAXIMUM RATINGS(1)
Loop Supply Voltage, VPS ............................ Dependent on External FET
XTR Supply Voltage, External VS (Referenced to IRET Pin) ............ +5.5V
Input Voltage to Multiplexer (Referenced to IRET Pin) ................ 0V to VS
Output Current Limit ................................................................ Continuous
Storage Temperature Range ......................................... 55°C to +125°C
Junction Temperature .................................................................... +165°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
PACKAGE/ORDERING INFORMATION(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.
PRODUCT
XTR108EA
"
PACKAGE-LEAD
SSOP-24
"
PACKAGE
DESIGNATOR
DBQ
"
SPECIFIED
TEMPERATURE
RANGE
40°C to +85°C
"
PACKAGE
MARKING
XTR108EA
"
ORDERING
NUMBER
XTR108EA
XTR108EA/2K5
TRANSPORT
MEDIA, QUANTITY
Rails
Tape and Reel, 2500
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the specified temperature range, TA = 40°C to +85°C.
At TA = +25°C, VPS = 24V, and Supertex DN2540 external depletion-mode FET transistor, unless otherwise noted, all voltages measured with respect to IRET pin.
PARAMETER
VIN TO IOUT TRANSFER FUNCTION
Output
Specified Range
Over-Scale Limit Resolution
Fault Over-Scale Level(1)
Under-Scale Limit Resolution
Fault Under-Scale Level(1)
Output for Zero Input
Zero Error, Unadjusted
vs Temperature
vs Loop-Supply Voltage, VLOOP
vs Common-Mode Voltage
Adjustment Resolution, Zero Input
Adjustment Range, Zero Input
Span(2)
Initial, Unadjusted
Drift (vs Temperature)
Span Adjustment Resolution
Span Adjustment Range
PGA + Output Amplifier(3)
Nonlinearity, Ideal Input
PGA
Autozeroing Internal Frequency
PGA Offset Voltage (RTI)(4)
vs Temperature
vs Supply Voltage, VS
vs Common-Mode Voltage
Common-Mode Input Range
Input Bias Current
vs Temperature
Input Offset Current
vs Temperature
CONDITIONS
IO = VIN (Span) + 4mA
Digital Select: 21-28.5mA
Above Over-Scale Selected
Digital Select: 2.2-3.6mA
Below Under-Scale Selected
VIN = 0V
VLOOP = 7.5V to 24V
VCM = 0.2V to 3.5V
Span = IO/VIN
RVI = 6.34k
Full-Scale VIN = 50mV
VCM = 1V
VS = 4.5V to 5.5V
VCM = 0.2V to 3.5V
XTR108EA
MIN TYP MAX
UNITS
4
49.3
0.5
+1.0
0.2
0.4
±50
±0.2
0.02
±1
1.8
±4
±1
40
0.05
0.01
20
±1.5
3150
6.5
±10 ±50
±0.02
±0.5
105
0.2 VS 1.5
50
Doubles/10°C
10
Doubles/10°C
mA
mA
mA
mA
mA
µA
µA/°C
µA/V
µA/V
µA/Step
mA
%
ppm/°C
%
mA/V
%
kHz
µV
µV/°C
µV/V
dB
V
pA
pA
pA
pA
2 XTR108
www.ti.com
SBOS187C


Features XTR108 XTR108 SBOS187C – OCTOBER 2001 – REVISED JULY 2005 4-20mA, TWO-WIRE TRANSMITTER “Smart” Programmable wi th Signal Conditioning FEATURES q COMP LETE TRANSMITTER + RTD LINEARIZATION q TWO-WIRE, 4-20mA OUTPUT q VOLTAGE OUTPU T (0.5V to 4.5V) q ELIMINATES POTENTIOM ETERS AND TRIMMING q DIGITALLY CALIBRAT ED q 5V SUB-REGULATOR OUTPUT q SERIAL S PI BUS INTERFACE q SSOP-24 PACKAGE A PPLICATIONS q REMOTE RTD TRANSMITTERS q PRESSURE BRIDGE TRANSMITTERS q STRAIN GAGE TRANSMITTERS q SCADA REMOTE DATA A CQUISITION q WEIGHING SYSTEMS q INDUSTR IAL PROCESS CONTROL DESCRIPTION The XT R108 is a “smart,” programmable, 4- 20mA, two-wire transmitter designed for temperature and bridge sensors. Zero, span, and linearization errors in the a nalog signal path can be calibrated via a standard digital serial interface, e liminating manual trimming. Non-volatil e external EEPROM stores calibration se ttings. The all-analog signal path cont ains an input multiplexer, autozeroed programmable-gain instrumentation ampli.
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