# M5 Practice Problems.pdf - Practice Problems – 3CC3 M5...

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Practice Problems 3CC3 M5 ADC and DAC Problem 1 A computer is controlling the speed of a motor. The analog output voltage of an 8-bit DAC with V ref = 10V is amplified by a linear power amplifier to produce motor speeds from 0 to 1000 rpm. a. Calculate the change in the motor speed for a 1 LSB change in the DAC binary input? b. How many bits should be used if the computer is to be able to produce a motor speed that is within 2 rpm of the desired speed? Problem 2 A microcontroller with a 10-bit ADC has its ADC convertor set with V ref+ = 2.5 V, and V ref- = -2.5 V. Determine the digital output (in decimal) of the ADC if subjected to the following analog inputs. a. -1V b. 2 V Problem 3 What is the output voltage of a 4-bit R/2R DAC (below) with an input code of 1010 and a reference voltage of 10 volts? Problem 4 An 8-bit ADC converter with a 10-V reference converts a temperature of 0 o C into 00000000 digital outputs. If the temperature sensor sensitivity is 20 mV/degree, answer the following questions: a. What is the maximum temperature that the converter can measure?

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