VOLTAGE REFERENCES Application Note 1085: 2002 AMPLIFIER COM

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VOLTAGE REFERENCES Application Note 1085: 2002 AMPLIFIER COM

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CONVERSION/SAMPLING CIRCUITS
VOLTAGE REFERENCES
Application Note 1085: 2002
AMPLIFIER COMPARATOR CIRCUITS SWITCHES MULTIPLEXERS
Selectable-Range Current Loop This article shows example implementing 4-20mA 0-20mA current-loop output using voltage output digital-to-analog converter (DAC) converter.
Current-loop signals, opposed voltage signals, commonly used industrial systems because they much less subject noise relatively indifferent line length (because current unaffected line resistance). circuit Figure allows digital selection between standard ranges current-loop transmission common industrial systems (0-20mA 4-20mA).
Figure This circuit's single control input selects current-loop range 0-20mA 420mA.
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analog switch (IC2) controls resistive divider driven 2.5V reference (IC1), such that AGND offset either 0.4V, DAC's voltage (OUT minus AGND) either 1.6V. Thus, 20mA, AGND 20mA, 1.6V AGND 0.4V. voltage-output converter (IC3) drives converter associated resistors) produce current loop. Because DAC's output resistance voltage mode high (11k resistor values made large preserve accuracy. amp's outputdrive capability 80mA. maintain good linearity, reference voltage (IC3 should exceed similar version this article appeared October 2001 issue Times magazine.
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VOLTAGE REFERENCES Application Note 1085: 2002 AMPLIFIER COM

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