XTR108 Datasheet | Burr-Brown

FEATURES q PLETE TRANSMITTER + RTD LINEARIZATION q TWO-WIRE, 4-20m A 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, 4-20m A, 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 pensates for sensor DC offsets. Selectable up- and down-scale output indicates out-of-range and burnout 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 unmitted op amp can be used to convert current into a voltage. The XTR108 is specified for - 40°C to +85°C. EEPROM SCLK SDIO CS2 CS1 V/I-0 V/I-1 V/I-2 V/I-3 V/I-4 V/I-5 R1 R2 R3 R4 R5 Multiplexer Excitation SPI and Control Circuits Gain and Offset Linearization PGA IO V/I IRet VPS 4-20m A 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...