Saturday, 11 February 2012

Code Converters


Code converters convert one form o code into another form. For example BCD to 7-segment decoder converts BCD number into a form that is suitable to display on 7- segment LED display.
BCD to 7-segment decoder: 
      Above figure shows seven segment LED display. These are widely used in Digital clocks and at Traffic islands. BCD data can’t be displayed directly on this display. So a code converter is needed. This code converter takes BCD data and produces data in a format to display the corresponding BCD number.
      To display BCD number 1, b and c LEDs (shown in above figure) should glow and remaining should be in turn off state. Similarly for remaining numbers same technique is applied.

The truth table for this is shown below.

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