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TI Introduces High Accuracy, 4-20mA Transmitter for Industrial Sensors and Monitors

Oct 19, 2005

DALLAS (October 19, 2005) - Texas Instruments Incorporated (TI) (NYSE: TXN) today announced a high accuracy, 4-20mA transmitter in a miniature MSOP-8 package. Featuring low offset and span errors, the XTR117 offers simple over-scale and noise resistant signaling with low power consumption (250uA max). The new transmitter, from the company's Burr-Brown product line, has a wide operating voltage range of 7.5V to 40V and is tolerant of power surges up to 50V. Its small size and accurate 4-20mA output scaling are ideal for pressure, temperature and humidity transducers as well as industrial process monitors. (See www.ti.com/sc05222.)

The XTR117 is robust in harsh electrical environments and has a generous 3.75mA at 5V (sub-regulated) available for external sensor conditioning circuitry power. The Iout/Iin transfer function of x100 can easily be created for voltage output sensor conditioning circuits with one external scaling resistor.
The low quiescent current, accurate 4-20mA scaling (without calibration), small size and low cost of the XTR117 make it a clear choice over discrete implementations of this function. The device operates over the extended industrial temperature range of -40C to 125C.
The XTR117 provides an excellent central building block for two-wire 4-20mA designs which can pre-condition sensor signals through digitally calibrated sensor signal conditioning chips (such as PGA309), low power microcontrollers (such as MSP430), or discrete combinations of instrumentation amplifiers and voltage references (such as INA122, INA118 and REF31xx), or low power op amps and voltage references (such as OPA335, OPA344 and REF32xx).

Available Today

The XTR117 is available now in a MSOP-8 micro-package from TI and its authorized distributors. The device is priced at $0.90 in 1,000 piece quantities (suggested resale pricing). A 3mm x 3mm DFN-8 package option will be available in 1Q 2006.

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