hw9 - University of Florida EEL 4744 Dept. of Electrical...

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Unformatted text preview: University of Florida EEL 4744 Dept. of Electrical & Computer Engineering Page 1/1 Homework 9 1. A ten volt (maximum) signal is to be digitized to a resolution of at most 0.01 volts. How many bits are needed in an A/D converter to do this? 2. How does a successive approximation A/D converter work? 3. How does a flash converter work? 4. An A/D converter is required to digitize a 1 KHz sinusoidal waveform. What is the maximum allowable conversion time for the A/D? Assume a sample-and-hold circuit is being used to give the correct aperture time. 5. A transducer is to be used to find the temperature over a range of -100 to 100oC. We are required to read and display the temperature to a resolution of ±1oC. The transducer produces a voltage from -five to plus five volts over this temperature range with 5 milli volts of noise. Specify the number of bits in the A/D converter (a) based on the dynamic range and (b) based on the required resolution. 6. An A/D converter is to be specified for the following measurement: The signal is DC (it will not vary during the conversion time); the signal range is zero to ten volts; there is 1 mV of noise; when a one volt signal is being measured, the measurement is to be within ±0.5% of the true value. How many bits are required, and how would you specify the conversion time and aperture time? 7. How long must the program delay before using the A/D after powering it up? 8. The analog input ranges from 1 volt to 4 volts. a. What should VRH and VRL be? b. What is the resolution? c. The analog result register shows $56. What is the analog voltage? 9. The following bytes are written to the ATDCTL of HC12 processor to initiate the conversion. Give the channels expected in the A/D result registers ADR0H - ADR7H. Byte ADR0 ADR1 ADR2 ADR3 ADR4 ADR5 ADR6 ADR7 a. 00000000 b. 00000100 c. 00010000 d. 00010100 e. 01010000 f. 01001100 1 ...
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This note was uploaded on 11/13/2011 for the course EEL 4744c taught by Professor Staff during the Fall '09 term at University of Florida.

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