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hw4_A09_sol - ECE2801Homework# Solutions 1)()foreachofthe...

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ECE2801 Homework #4 – Analog-to-Digital Conversion and the ADC12  Solutions 1)   Define and present a numeric example (not from the class notes!) for each of the  following terms as they relate to analog to digital converters.  (15 pts) a.   Dynamic Range  =  Ratio of the largest to the smallest values that can be      measured, usually expressed in decibels (dB) For an Analog-to-Digital Converter -->  20log 10 (2 k where  k  = number of bits For 12 bit ADC -->     20log 10 (2 12 ) = 72.25 dB For a device   20log 10 ( largest reading/smallest reading ) b.   Full-scale range  -- Maximum or total range of analog values that can be represented For and ADC with  Vref+ = 2.5V and Vref- = GND, the FSR = 2.5V c.   Resolution  (Single bit resolution) – Smallest change in value that can be measured Resolution = FSR/number of codes = FSR/ 2 k        where  k  = number of bits How many internal and external input channels (INCH x ) does the MSP430's ADC12  have?     ADC12 has 8 external and 4 internal analog inputs When the ADC12 makes a conversion, in what register(s) is the result(s) stored? The ADC12MEMx registers.  There are 16 of these registers.  If the SREF bits = 000, what are the values of the ADC12's V ref+  and V ref-  in volts ( Hint you may need to look on the Olimex Schematic).     From register definitions SREF = 000 corresponds to V ref+  = AV cc  and V ref-  = AV ss From the Schematic AV cc  =3V  and AV ss  = GND = 0V.
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2)  An accelerometer is a device that measures the force of gravity.  A particular  accelerometer has a range of +  2.7 g but is currently being used simply as a single axis  tilt sensor as shown below.  The analog output voltage of the accelerometer is 1.0 V at 0  g and the device has a sensitivity of 371 mV per g. Assume the output of the 
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