You want to buy an ADC to interface a pressure sensor with your laptop. Looking

Question

You want to buy an ADC to interface a pressure sensor with your laptop. Looking at the calibration curve of the pressure sensor, you notice that the slope is 0.1 volts/Pa and that there's negligible offset on the y axis. You want to be able to resolve pressure changes as small as 0.1 Pa. The nominal pressure range you want to detect is from 0 to 100 Pa. Based on the sensor sensitivity, what should be the quantization interval Q of the ADC that you'll buy? What is the minimum number of bits the ADC should have? If this ADC produced positive codes only, what is the integer code that 11 Pa pressure would produce? Remember to compute the actual quantization interval, Q, for the number of bits you selected in part c.

Explanation / Answer

Quantization interval= 0.1

L= number of quantization level= 100/(2*0.1)= 500.

N= number of bit

Then 2^N= 500

N= 9 bit.

Code for 11 pa= 001101110

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