This preview shows page 1. Sign up to view the full content.
Unformatted text preview: University of Florida
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
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.
ADR0 ADR1 ADR2 ADR3 ADR4 ADR5 ADR6 ADR7
f. 01001100 1 ...
View Full Document