Logarithmic LED Panel Display Has 72dB Range

Abstract:Thisapplicationnotepresentsasimple,stand-alonepanel-displaycircuitthatdrivesa12-LEDlogarithmiccolumn.TheLEDcolumnisa12-steplogindicatorwith6dBstepheight,formingatotalcolumnrangeof72dB.Thecircuit'saccuracyandstabilityaredefinedbythespecificationsforthedesign'sADC.TheMAX127612-bitADCisfeatured.Maxim>AppNotes>A/DandD/AConversion/SamplingCircuitsDisplayDriversKeywords:logarithmicpaneldisplays,LEDpanels,analog-digitalconverters,ADCsSep21,2009APPLICATIONNOTE4442LogarithmicLEDPanelDisplayHas72dBRangeBy:TamerMogannamAbstract:Thisapplicationnotepresentsasimple,stand-alonepanel-displaycircuitthatdrivesa12-LEDlogarithmiccolumn.TheLEDcolumnisa12-steplogindicatorwith6dBstepheight,formingatotalcolumnrangeof72dB.Thecircuit'saccuracyandstabilityaredefinedbythespecificationsforthedesign'sADC.TheMAX127612-bitADCisfeatured.ThisdesignideaappearedintheOctober31,2006issueofEETimesmagazine.Panel-levellogarithmic-columndisplaysareusuallybuilti