Decimal To BCD Encoder

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DECIMAL TO BCD ENCODER 

INDEX

NO.	TITLE	PAGE NO.
1	Introduction	5
2	Decimal to BCD encoder diagram	6
3	Working Principle of Decimal to BCD conversion using IC-74147	7
4	Truth Table	8
5	Pin out diagram and logical diagram	9
6	Application of Decimal to BCD encoder	10
7	Limitations with Decimal to BCD encoder	11
8	References	12

INTRODUCTION

                  Encoders are the electronic equipment which converts one form of input into another one. Encoders are used to generate a coded output from a single active numeric input. Encoders are widely used in various devices like Calculators, Computers, Mobile phones, ATM machines and even also in our regular Television. IC-74147 provides us facility to convert Decimal form of input into Binary form of output. As it convert Human friendly numerical into machine friendly language i.e. in the form of ‘0’s and ‘1’s, hence it is quite important to study about this invention in very serious manner to understand that how this Decimal to BCD conversion operation perform.

                  In our 21^st century we get digitalized day by day and decimal to binary Encoder performs very important role to communicate Human being with Machine. Therefore I choose seminar topic on Decimal to BCD encoder to get proper information about encoder and spread it unto last student in S.Y.B.Sc (comp.sci.).

                               DECIMAL TO BCD ENCODER DIAGRAM

In Decimal to BCD encoder binary output in the form of ‘1’s and ‘0’s which is calculated in encoder as below:

Equations:

1. A=8+9

2. B=4+5+6+7

3. C=3+4+6+7

4. D=1+3+5+7+9

WORKING PRINCIPLE OF DECIMAL TO BCD CONVERSION USING IC-74147

In above figure we arrange a circuit of Decimal to BCD encoder. There are four OR gates are arrange in such a manner that they provides a Binary form of output when we give Decimal form of input. In above circuit we arrange 10 key point which is connected to the electric supply and provides decimal from of input to the circuit by passing voltage in a certain wire. Every wire is connected to the OR gate. We know that output of every OR gate is ‘1’ when at least one input is high.

 Working of a circuit:

When we press key 5 then by pressing key the voltage in the key no.5 flows towards the wire which is connected to the key no.5, as the wire connected to the 2^nd and 4^th logical gate then logical gate no.2 and 4 provides output to the forward in the form of voltage. This working of a circuit perform Decimal to BCD conversion operation.

Which is shown in below truth table.

Truth Table

   

PIN-OUT DIAGRAMES AND LOGICALL TABLE

Fig: pin-out diagram

APPLICATION OF DECIMAL TO BCD ENCODER

Fig: Application of Decimal to BCD encoder

(Seven segment display)

As we naturally live in a Decimal world, we need some way of converting these Decimal numbers into Binary (base-2) environment that computers and digital electronic devices understand, and binary coded decimal allows us to do that.

In above mentioned figure we see a circuit structure of seven segment display which is one of the application of Decimal to BCD encoder. In this circuit we press a decimal numbers which is display on digital electronic device in the form of decimal number.

HOW IT IS HAPPEN:

When we press decimal numbers then BCD encoder converts it into machine friendly language i.e. in form of ‘0’ and ‘1’ which later converts into seven segmented output to the digital screen.

  

  

LIMITATIONS WITH DECIMAL TO BCD ENCODER

·         For 10 bits input, there can be 210 possible combinations, out of which only 10 are used using 4 output lines.

·         The discrepancy of 0 output due to all inputs being 0 or D 0 being 0 is resolved by using additional input known as enable.

·         Only one time input can be active at any given time.

  

References

1.”general decimal arithmetic” http://speleotrove.com/decimal

2.”ILERPG”           http://publib.boulder.ibm.com/iseries/v5r2/ic2924/books/c0925083170.htm

3. IBM BM 1401/1440/1460/1410/7010 character code chart in BCD order.

4. http://www.se.ecu.edu.eu/units/ens1242/lectures/ens Notes 08.pdf

5. Signaling protocols and switching (SPS) guidelines for using Abstract syntax notation “”http://www.etsi.org/deliver/etsi etr/001 099/060/02 60/etr 060e02o.pdf”

6. http://www.google.com/search

7. http://www.wikipedia.com

8. Digital System Hardware (S.Y.B.Sc comp. sci.)

9. http://www.technoasia.com

10. Digital Electronics (F.Y.Bsc comp. sci.)

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