Display interfacing: A binary number can be converted to a 7-segment display pattern by using a(n) ________.
Digital Electronics
Digital Concepts
Difficulty: Easy
Choose an option
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Adecoder
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Bencoder
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Cmultiplexer
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Dmagnitude comparator
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Epriority encoder
Answer
Correct Answer: decoder
Explanation
Introduction / Context:Seven-segment displays require segment control signals (a–g). Converting a binary code (often BCD) into segment lines is a classic display-interface problem.
Given Data / Assumptions:
- Input: binary/BCD code for a digit.
- Output: seven segment control lines.
- Goal: identify the digital block that performs this mapping.
Concept / Approach:A decoder maps an encoded input into a set of outputs; a BCD-to-7-segment decoder asserts the correct segment lines for each digit. An encoder does the reverse (many inputs to coded output).
Step-by-Step Solution:
Step 1: Recognize the direction: code → many segment lines.Step 2: This is a decode operation.Step 3: Choose “decoder.”Verification / Alternative check:Standard ICs like 7447/7448 (TTL) are BCD-to-7-segment decoders/drivers, confirming the mapping role.
Why Other Options Are Wrong:
Encoder: Opposite direction (many lines to fewer coded bits).Multiplexer: Selects one of many inputs to a single output; not direct code-to-segment mapping.Magnitude comparator: Compares numbers; does not generate segment codes.Priority encoder: Still an encoder, not a decoder.Common Pitfalls:Confusing encoder vs. decoder directionality.
Final Answer:decoder