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National Diploma In EngineeringData CommunicationsElectronics B NIIIAssignment no 2AD and DA Convertors and Display DevicesWeighting 20Name Malcolm BrownClass NDD2Tutor Ken HughsContents PageTask 3AD and DA Convertors 4Analogue and Digital Signals 4Analogue Digital Conversions 5Analogue to Digital Convertors 6Digital To Analogue Converter 8Glossary Of Terms 10Visual Display Devices 11Seven-Segment Displays 14Dot Matrix Displays 16Bibliology 18TaskAD and DA Convertors Explain two methods of converting analog signals to digital signals and compare themExplain one method of digital to analog conversion Choose two AD convertor devices fromthe catalogue and list their characteristics performance cost applications etcDisplay DevicesDescribe how LED and LCD display devices operate - ie explain the principle behind theiroperation Describe the features of the 7-segment star-burst and dot matrix displaysChoose some devices from the catalogues and describe themYou are required to produce a written report on your work The report should be instandard report format and comprise of a front page with title contents page summaryintroduction main body of the report describing the task and how you met the requirementsof the task circuit diagrams etc and conclusions Appendices may be placed in the reportif necessaryThe report should be word processed and presented in a plastic folder Your name class andsubject should be clearly visibleAD and DA ConvertorsAnalogue and Digital SignalsAnalogue Signals - Signals whose amplitude andor frequency vary continuously eg soundFig 11 illustrates an analogue signal-Fig 11 Illustration of an analogue signalDigital Signals - Signals which are not continous in nature but consist of discrete pulsesof voltage or current known as bits which represent the information to be processedDigital voltages can vary only in discrete steps Normally only two levels are used 0and 1 Fig 12 illustrates a digital signalFig 12 Illustration of a digital signalAnalogue Digital ConversionsIn todays electronic system it is often necessary that the overall system may not beentirely analogue or entirely digital in nature Thus a digital system may be controlledby input signals which are the amplified analogue outputs perhaps
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