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AA 320 Pre-lab Assignment #6 - 2011

# AA 320 Pre-lab Assignment #6 - 2011 - Binary A B C G H 0 0...

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Page 1 of 2 AA320 – Aerospace Instrumentation Prelab Assignment for Lab 6. Week of Nov. 14, 2011 Digital circuits: A-to-D converter and D-to-A converter for data acquisition. Read: Notes on Digital Circuits (on AA 320 Web page) Optional reading: Ch 13 & 14 in Rizzoni (Digital Systems) IMPORTANT: This prelab is crucial to understanding the operation of A-to-D, the binary encoder, and D-to-A. 1. Binary numbers. What is the binary representation (1's and 0's) of decimal number 115? How many bits are needed to represent 197046 in binary format? (You don't need to find the explicit binary representation.) What is the decimal value of the binary number 110110? 2. Digital encoder. In Lab 6 you will build a 2-bit A-to-D converter. Part of the circuit is to convert the 3 comparator outputs (which indicate signal level) to binary format (2 bits). Below is the circuit you will build for this encoding, and the "truth table" for the encoder: Comparator Outputs

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Unformatted text preview: Binary A B C G H 0 0 0 0 0 1 0 0 0 1 1 1 0 1 0 1 1 1 1 1 Verify that the circuit will actually perform the desired function by filling out the following truth table (additional circuit points D, E, F are shown on the circuit). Use the truth table rules for NAND gates given in "Notes on Digital Circuits". Comparator Outputs Intermediate Levels Binary output A B C D E F G H 0 0 0 1 0 0 1 1 0 1 1 1 Page 2 of 2 3. A-to-D Converter. How many comparators would be needed for a 4-bit A-to-D converter? Suppose you wished to digitize an analog signal that ranged from +1 V to +5 V with an 8-bit A-to-D converter. What would the resolution, Δ V , be? [ V is the smallest change in analog input voltage that would cause a change in the digital representation of the signal.] 4. D-to-A Converter. Design and sketch a 3-bit D-to-A converter for a system with a logic HI voltage V HI = 5 V, and a maximum output voltage of V max = 4 V....
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AA 320 Pre-lab Assignment #6 - 2011 - Binary A B C G H 0 0...

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