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10_V_WITH_TC_TRIMMlNG

2015-03-22 20:16  
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10_V_WITH_TC_TRIMMlNG
Provides temperature-compensation trimming to give lowest possible reference-voltage drift for A/D converter. Reference zener is LM199A having 0.5 PPM/℃ drift that is independent of operating current. Low-drift combination of LM121 and LMl08A has drift predictably proportional to offset voltage, permitting use of potentiometers for trimming to better than 1 PPM/℃. Article gives details of trimming procedure to be used during temperature runs.- R. C. Dobkin, Don’t Forget Reference Stabillity When Desiging A-to-D Converters, EDN Magazine, June 20, 1977, p l05-108.