AD and DA Convertors and Display Devices

AD and DA Convertors and Display Devices - National Diploma...

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National Diploma In Engineering Data Communications D Electronics B NIII E Assignment no. 2 A A/D and D/A Convertors and Display Devices A Weighting 20% W Name: Malcolm Brown N Class: NDD2 C Tutor: Ken Hughs K Contents Page C Task 3 A/D and D/A Convertors 4 Analogue and Digital Signals 4 Analogue / Digital Conversions 5 Analogue to Digital Convertors 6 Digital To Analogue Converter 8 Glossary Of Terms 10 Visual Display Devices 11 Seven-Segment Displays 14 Dot Matrix Displays 16 Bibliology 18 1 Task A/D and D/A Convertors Explain two methods of converting analog signals to digital signals and compare them. Explain one method of digital to analog conversion. Choose two A/D convertor devices from the catalogue and list their characteristics, performance, cost, applications etc. a Display Devices Describe how LED and LCD display devices operate - ie explain the principle behind their operation. Describe the features of the 7-segment, star-burst and dot matrix displays. Choose some devices from the catalogues and describe them. d You are required to produce a written report on your work. The report should be in standard report format and comprise of a front page with title, contents page
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the requirements of the task, circuit diagrams etc. and conclusions. Appendices may be placed in the report if necessary. b The report should be word processed and presented in a plastic folder. Your name class and subject should be clearly visible. c A/D and D/A Convertors Analogue and Digital Signals A Analogue Signals - Signals whose amplitude and/or frequency vary continuously eg. sound. Fig 1.1 illustrates an analogue signal:- s Fig 1.1 Illustration of an analogue signal F Digital Signals - Signals which are not continous in nature but consist of discrete pulses of voltage or current known as bits which represent the information to be processed. Digital voltages can vary only in discrete steps. Normally only two levels are used ( 0 and 1 ).Fig 1.2 illustrates a digital signal. l Fig 1.2 Illustration of a digital signal F Analogue / Digital Conversions A In todays electronic system it is often necessary that the overall system may not be entirely analogue or entirely digital in nature. Thus a digital system may be controlled by input signals which are the amplified analogue outputs, perhaps of some measuring transducer (termister, LDR). Similarly a digital system output may be required to control the measured analogue system via analogue control values.Interfacing is therefore required between the analogue and digital subsystems and it is necessary to be able to convert an analogue signal into a digital equivalent signal and visa versa. A/D and D/A convertors are therefore used. An analogue signal cannot be represented exactly by a digital signal and must be
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AD and DA Convertors and Display Devices - National Diploma...

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