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4_20_mA_SOURCE

2014-11-25 23:44  
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4_20_mA_SOURCE
DigitaI input to multiplying digital-to-analog converter determines load current in range of 4 to 20 mA with 15.6-μA resolution. R1 adjusts ratio of full-scale to zero-scale current at output 1 of MDAC and R3 sets circuit offset and span to give correct end-range currents for load. Maximum load compliance is 25 V. Opamp types are not criticaL-J. Wilson and J. Whitmore, MDAC's Open Up a New World of Digital-Control Applications, EDN Magazine, Sept. 20, 1978, p 97-105.