Lecture19a - Lecture 19. ANALOG-TO-DIGITAL CONVERTERS...

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Lecture 19. ANALOG-TO-DIGITAL CONVERTERS Objectives: Topics: Describe ADC operation Find ADC inputs, outputs, and resolution Counting ADC Dual-Slope ADC Bin-Encoded ADC
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EXAMPLE 8-bit binary-weighted ADC, V ref =5V. a) V IN (for 00010000) - ?; b) B(v IN =1.1V) - ?; c) resolution; d) extra v IN to get +1 bit (from v IN =1.1V) a) (00010000) = 16 = ) 1 2 ( int N ref IN V v B b) = ) 1 2 ( 5 1 . 1 int 8 B c) resolution d) 1.1V (00111000)=56 +1 bit = (00111001)=57 Why not 0.2V?
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EXAMPLE 8-bit bin-encoded ADC, V ref =5V. a) Range of V IN (for 00011111) - ?; b) B(v IN =1V) - ?; c) resolution a) (00011111) = 5 1 ) 1 ( 1 + + < < + N V m v N V m ref IN ref b) c) resolution
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Counting A/D Converter N-bit digital output + Binary counter D/A - Start – reset counter, sample the signal and start counting up As the counter counts up v 1 increases until: At t=t 1 v 1 exceeds v IN Comparator output changes and stops the counter N-bit digital signal goes to output Sample v IN , start counting again
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This note was uploaded on 06/30/2010 for the course EECE 315 taught by Professor Nikulin during the Fall '08 term at Binghamton University.

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Lecture19a - Lecture 19. ANALOG-TO-DIGITAL CONVERTERS...

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