ME365chap3_Digit

# ME365chap3_Digit - Digital Data Acquisition Data...

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KARTIK B. ARIYUR PURDUE UNIVERSITY Digital Data Acquisition Data Representation - Digital vs. Analog Number Systems (Binary Numbers) Analog-to-Digital Conversion State of the art examples: http://www.analog.com/en/analog-to-digital- converters/products/index.html Digital Data Acquisition 1

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KARTIK B. ARIYUR PURDUE UNIVERSITY Data Representation - Digital vs. Analog Digital : 1s and 0s, (1001 1011) 2 Advantages Disadvantages Analog : 3.141592687. .., 1/3 Advantages Disadvantages Digital Data Acquisition 2
KARTIK B. ARIYUR PURDUE UNIVERSITY Binary Representation of Integers n bits binary: represents 2 n integers. Ex: 4 bit Binary: 2 4 = 16 integers, (0, 1, 2, …, 15). MSB: M ost S ignificant B it LSB: L east S ignificant B it Binary Numbers ( ) ' . ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) where or MSB LSB bits d d d d d d d d d d d d d s n n n n n n n n n i n 1 2 3 2 1 0 2 1 1 2 2 3 3 2 2 1 1 0 0 2 2 2 2 2 2 0 1 1 ;   Digital Data Acquisition 3

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KARTIK B. ARIYUR PURDUE UNIVERSITY Binary Numbers - Coding Positive Integers Straight Binary Decimal (10 1 10 0 ) 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 Binary ( 2 3 2 2 2 1 2 0 ) 2 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 Digital Data Acquisition 4
KARTIK B. ARIYUR PURDUE UNIVERSITY Analog-to-Digital Conversion Converts analog voltages to binary integers. ADC Analog Voltage Binary Integers Sampling -1.5 -1 -0.5 0 0.5 1 1.5 0 2 4 6 8 10 Voltage Time Digital Data Acquisition 5

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KARTIK B. ARIYUR PURDUE UNIVERSITY Analog-to-Digital Conversion ADC calibration Calibration Curve ( 3 bit ADC) 7 6 5 4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Analog Voltage Integer Code 3 2 1 0 Digital Data Acquisition 6
KARTIK B. ARIYUR

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## This note was uploaded on 04/23/2011 for the course ME 365 taught by Professor Merkle during the Fall '07 term at Purdue.

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ME365chap3_Digit - Digital Data Acquisition Data...

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