Set03_4

Set03_4 - Digital Data Acquisition Data Representation -...

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Unformatted text preview: Digital Data Acquisition Data Representation - Digital vs. Analog Analog-to-Digital Conversion Number Systems (Binary Numbers) Slide 1 ME365 Digital Data Acquisition Galen King Purdue University Sampling & Aliasing Data Representation Data Representation Data Representation Data Representation - D i g i t a l v s . A n a l o g Digital : 1s and 0s, (1001 1011) 2 Advantages Analog : 3.141592687..., 1/3 Advantages Slide 2 ME365 Digital Data Acquisition Galen King Purdue University Disadvantages Disadvantages Analog Analog Analog Analog-to to to to-Digital Conversion Digital Conversion Digital Conversion Digital Conversion Converts analog voltages to binary integers. ADC Analog Voltage Binary Integers (0s & 1s) Sampling Slide 3 ME365 Digital Data Acquisition Galen King Purdue University-1.5-1-0.5 0.5 1 1.5 1 2 3 4 5 6 7 8 Time Voltage Analog Analog Analog Analog-to to to to-Digital Conversion Digital Conversion Digital Conversion Digital Conversion ADC calibration Slide 4 Calibration Curve ( 3 bit ADC) 1 2 3 7 6 5 4 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Analog Voltage Integer Code ME365 Digital Data Acquisition Galen King Purdue University Input Range Unipolar: ( 0, V ADCMAX ) Bipolar: ( -V ADCMAX , +V ADCMAX ) (Nominal Range) Clipping : |V > |V , then |V = |V Analog Analog Analog Analog-to to to to-Digital Conversion Digital Conversion Digital Conversion Digital Conversion Slide 5 ME365 Digital Data Acquisition Galen King Purdue University If |V IN | > |V ADCMAX |, then |V OUT | = |V ADCMAX | time V ADCMAX-V ADCMAX Quantization Interval ( Q ) n bit ADC, the input range is divided into 2 n-1 intervals. Analog Analog Analog Analog-to to to to-Digital Conversion Digital Conversion Digital Conversion Digital Conversion V V ADC ADC- MAX min Slide 6 ME365 Digital Data Acquisition Galen King Purdue University 3 bit ADC: Q n =- 2 1 1 2 3 7 6 5 4 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Analog Voltage Integer Code 1 2 3 7 6 5 4- 2- 1.5- 1.0- .5 0.0 0.5 1.0 1.5 Analog Voltage Integer Code Voltage to Integer Code n bit ADC Analog Analog Analog Analog-to to to to-Digital Conversion Digital Conversion Digital Conversion Digital Conversion V ADCmin V ADCMAX Q Voltage: V IN Slide 7 ME365 Digital Data Acquisition Galen King Purdue University Code Round =- V V Q IN ADC min Code: 2 n- 1 Voltage to Integer Code (cont.) Ex: 3 bit ADC, V ADCmin = - 2 V and V ADCMAX = 1.5 V V IN = 1.25 V Q: Find the integer code for V IN ....
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Set03_4 - Digital Data Acquisition Data Representation -...

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