Deglitching Techniques for High-Voltage R-2R DACs

InanR-2RDACdesignwithsupplyvoltagesexceeding±5V,largevoltageglitches(upto1.5V)canoccurduringtheDAC'smajor-carrytransitions.Theseglitchescanpropagatethroughtheoutputbufferamplifierandappearatoutput.Theslewingofthelevelshiftersthatcontrolthetop(VREF+)andbottom(VREF-)single-poledouble-throwswitches(S0toSN)causestheglitchesMaxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSKeywords:DeglitchingTechniquesforHigh-VoltageR-2RDACsMay01,2001APPLICATIONNOTE583DeglitchingTechniquesforHigh-VoltageR-2RDACsInanR-2RDACdesignwithsupplyvoltagesexceeding±5V,largevoltageglitches(upto1.5V)canoccurduringtheDAC'smajor-carrytransitions.Theseglitchescanpropagatethroughtheoutputbufferamplifierandappearatoutput.Theslewingofthelevelshiftersthatcontrolthetop(VREF+)andbottom(VREF-)single-poledouble-throwswitches(S0toSN)causestheglitches(Figure1).Ifeachswitchofthe"inverted"R-2Rladderwereturnedonand/oroffinstantaneously,glitchamplitudesattheDACoutput(orinputoftheoutputbufferampli