Digital Electronics Technology Landon Johnson Encoding Decoding and

Encoder/Decoder Competencies 52. Given four different input combinations to a 10 line to 4

Encoder/Decoder Vocabulary ENCODER- a digital circuit that produces a binary output code depending on

ENCODERS AND DECODERS ONLY ONE INPUT ACTIVATED AT A TIME BINARY CODE OUTPUT BINARY

THE 8421 BCD CODE • BCD stands for Binary-Coded Decimal. • A BCD number

ELECTRONIC ENCODER DECIMAL TO BCD output Decimal input 7 5 3 00 10 0

DECODERS: BCD TO 7 -SEGMENT DECODER/DRIVER Decimal output LED BCD input 0 10 01

TEST Q #5#1 - What is the decimal output from the decoder that #2#3#4

TEST ANSWER THE FOLLOWING QUESTIONS WITH ONE OR MORE OF THESE WORDS: MUX, DEMUX,

Slides: 18

Download presentation

Digital Electronics Technology Landon Johnson Encoding, Decoding, and Seven-Segment Displays

Encoder/Decoder Competencies 52. Given four different input combinations to a 10 line to 4 line encoder, the student will state the output combinations with 100% accuracy. 53. Given four different input combinations for a 4 line to 10 line decoder, the student will state the output combinations with 100% accuracy.

Encoder/Decoder Vocabulary ENCODER- a digital circuit that produces a binary output code depending on which of its inputs are activated. DECODER- a digital circuit that converts an input binary code into a single numeric output.

ENCODERS AND DECODERS ONLY ONE INPUT ACTIVATED AT A TIME BINARY CODE OUTPUT BINARY CODE INPUT ONLY ONE OUTPUT ACTIVATED AT A TIME

THE 8421 BCD CODE • BCD stands for Binary-Coded Decimal. • A BCD number is a four-bit binary group that represents one of the ten decimal digits 0 through 9. Example: Decimal number 4926 4 9 2 6 8421 BCD coded number 0100 1001 0010 0110

ELECTRONIC ENCODER DECIMAL TO BCD output Decimal input 7 5 3 00 10 0 11 Decimal to BCD Encoder 0 • Encoders are available in IC form. • This encoder translates from decimal input to BCD output.

10 line to 4 line Encoder

10 line to 4 line Encoder

4 line to 10 line Decoder

DECODERS: BCD TO 7 -SEGMENT DECODER/DRIVER Decimal output LED BCD input 0 10 01 01 BCD-to 7 -Segment Decoder/ Driver • Electronic decoders are available in IC form. • This decoder translates from BCD to decimal. • Decimals are shown on an 7 -segment LED display. • This IC also drives the 7 -segment LED display.

TEST Q #5#1 - What is the decimal output from the decoder that #2#3#4 appears on the 7 -segment display? Answer: 6 3 0 9 7 BCD input Decimal output 010 100 0110 BCD-to 7 -Segment Decoder/ Driver ?

TEST

TEST ANSWER THE FOLLOWING QUESTIONS WITH ONE OR MORE OF THESE WORDS: MUX, DEMUX, ENCODER, DECODER. A. Has more inputs than outputs. ENCODER, MUX B. Uses select inputs. MUX, DEMUX C. Can be used in parallel-to-serial conversion. MUX D. Produces a binary code at its output. ENCODER E. Only one of its outputs is activated at one time. DEMUX, DECODER F. Used to route input signals to one of several outputs. MUX G. Used to generate arbitrary logic functions. MUX, DEMUX H. 3 line-to-8 line or binary to octal. DECODER I. Data Selectors are also MUX.