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XTR108 Datasheet(PDF) 1 Page - Burr-Brown (TI) |
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XTR108 Datasheet(HTML) 1 Page - Burr-Brown (TI) |
1 / 32 page XTR108 SBOS187C – OCTOBER 2001 – REVISED JULY 2005 www.ti.com 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 © 2001-2005, Texas Instruments Incorporated SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners. 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. XTR1 08 SPI and Control Circuits 4-20mA EEPROM Linearization Excitation IO I Ret V/I-0 V/I-1 V/I-2 V/I-3 V/I-4 V/I-5 RTD R1 R2 R3 R4 R5 PGA V/I V PS RLOAD XTR108 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. |
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