ECET 340 Week 4 Homework 4

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DEVRY ECET 340 Week 4 Homework 4

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• 1. Determine the conversion time for an ADC0804
  (8-bit), where 66 clocks per bit are required, if
  its clock frequency is 50 kHz.
• 2. If an 8-bit SAR has Vref 10 V, what is the
  binary value for an input voltage of 7.28 V?
• 3. What is the percent error for the binary
  answer found in Problem 2?

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• 4. Given an 24 MHz bus speed. Write down the
  line(s) of instruction which set the ATD1 unit
  for 2MHz conversion frequency, 10-bit resolution
  and 8 A-to-D clocks per sample time.
• 5. A single 10-bit, left justified conversion of
  3.75V is complete in ATD0. Assume and
• i. Name the register(s) where the result of the
  conversion is found
• ii. What are the values in each of the 16-bits of
  this register after conversion is complete?
  Assume the result is unsigned. Show work
• 6. Assume that a position-sensitive potentiometer
  can measure up to 25 cm over a voltage range of 0
  to 5 V. If an 8-bit ADC outputs a value of 0111
  1010, what is the distance measured?
• 7. Design the basic interface circuit (using an
  op amp) for a temperature sensor that covers a
  range of 0 to 70C if the output of the sensor
  is 2 mV/1C and the ADC voltage range is 0 to 4
  V.
• 8. Design an amplifier suitable for converting
  the output voltage from an LM35 temperature
  sensor (10 mV/C) into a signal that makes use of
  the full input voltage range

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• (0-5V) of the HCS12 ADC port pins. Assume the
  LM35 is to measure temperatures from 0C up to
  150C. Show work and circuit!
• 9. Given a sensor with W that outputs voltage in
  the range 1.25V to 4.25V. Show the complete
  interface circuitry needed to connect it to the
  A/D unit built-in to the HC12 Controller.
• 10. Write the lines of C code needed to configure
  the A/D converter, start the conversion, and
  output a hex integer in the range 0x0000 to
  0xFFFF to the variable called data1 that is
  proportional to airflow input (0.0 to 1.0
  litre/min). No further conversion is required