A/D and D/A Convertors and Display Devices

Essay by MalUniversity, Bachelor's January 1996

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Contents Page

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


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.

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.

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 summary, introduction, main body of the report describing the task and how you met the requirements of the task, circuit diagrams etc.

and conclusions. Appendices may be placed in the report if necessary.

The report should be word processed and presented in a plastic folder. Your name class and subject should be clearly visible.

A/D and D/A Convertors

Analogue and Digital Signals

Analogue Signals - Signals whose amplitude and/or frequency vary continuously eg. sound. Fig 1.1 illustrates an analogue signal:-

Fig 1.1 Illustration of an analogue signal

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.

Fig 1.2 Illustration of a digital...