You want to buy an to interface a pressure with Looking at the curve of the pres

Question

You want to buy an to interface a pressure with Looking at the curve of the pressure notice your laptop, and that there's that the negligible offset on the y axis, You want to be able to resolve pressure changes as small as The nominal pressure>e you want to detect is from 0 to 100 Pa 1. on the sensor sensitivity, what should be the quantization interval Q o the ADC that buy? 2. What is the minimum number of bits the ADC should have? 3. 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

Slope = 0.1 volt/Pa

So, 1 Pa pressure will generate 0.1 volt
The range of pressure is 0 to 100 Pa and small change to resolve is 0.1 Pa.

(1).

Volatage change in 0.1 Pa change of pressure is 0.1 x 0.1 = 0.001

So,Quantization interval Q = 0.005 volt

(2).

Now, The small change that can be resolved is 0.1 Pa.
The Max value of pressure is 100 Pa.

Minimum steps required    = Max Pressure / Small change in pressure
                       = 100 / 0.1
                       = 1000

For 1000 steps, minimum 10 bit ADC have to use as 2^10 = 1024.

(3).

For 11 Pa pressure, The code = pressure x Max Steps / Max Pressure
                           = 11 x 1023 / 100
                           = 112.53
So, the intergal code for 11 Pa will be 112.

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