Whenaweakpowersupplyisusedorwhenthedeviceisintendedtobeusedinnoisyenvironment,itisrecommendedthatfigure13.3fromtheApplicationInformationsectionisused.Thelow-passfilterformedbyR1andC1andthezenerdiodeZ1bypassthedisturbancesorvoltagespikesoccurringonthedevicesupplyvoltageVDD.ThediodeD1providesadditionalreversevoltageprotection.