XTR116

XTR116 XTR115 XTR115 XTR116 SBOS124A – JANUARY 2000 – REVISED NOVEMBER 2003 4-20mA CURRENT LOOP TRANSMITTERS FEATURES q LOW QUIESCENT CURRENT: 200µA q 5V REGULATOR FOR EXTERNAL CIRCUITS q VREF FOR SENSOR EXCITATION: XTR115: 2.5V XTR116: 4.096V q LOW SPAN ERROR: 0.05% q LOW NONLINEARITY ERROR: 0.003% q WIDE LOOP SUPPLY RANGE: 7.5V to 36V q SO-8 PACKAGE DESCRIPTION The XTR115 and XTR116 are precision current output converters designed to transmit analog 4-to-20mA signals over an industry standard current loop. They provide accurate current scaling and output current limit functions. The on-chip voltage regulator (5V) can be used to power external circuitry. A precision on-chip VREF (2.5V for XTR115 and 4.096V for XTR116) can be APPLICATIONS q 2-WIRE, 4-20mA CURRENT LOOP TRANSMITTER q SMART TRANSMITTER q INDUSTRIAL PROCESS CONTROL q TEST SYSTEMS q COMPATIBLE WITH HART MODEM q CURRENT AMPLIFIER q VOLTAGE-TO-CURRENT AMPLIFIER used for offsetting or to excite transducers. A current return pin (IRET) senses any current used in external circuitry to assure an accurate control of the output current. The XTR115 is a fundamental building block of smart sensors using 4-to-20mA current transmission. The XTR115 and XTR116 are specified for operation over the extended industrial temperature range, –40°C to +85°C. XTR115 XTR116 +5V VREG 8 +5V V+ Regulator 7 XTR115: 2.5V XTR116: 4.096V VREF 1 Voltage Reference B RIN IIN 6 2 + A1 VLOOP RL VIN – 3 IRET R1 2.475kΩ RLI...