5. A 10-bit, unipolar A/D with a VFs- 5.00 V and a 44 us conversion time is used

Question

5. A 10-bit, unipolar A/D with a VFs- 5.00 V and a 44 us conversion time is used to collect data on time constant measurement. Thus, the input voltage has the form V()-4(1 er) Determine the minimum value of t, the system time constant, for which reliable samples can be taken if no sample-and-hold circuit is used. 6. Flow is to be measured and input to a computer. For maximum resolution it is desired that a digital output from an 8-bit A/D of 0 corresponds to a flow rate of 30 m/h and a digital output of 255 corresponds to a flow rate of 60 m/h. The flow is measured as a voltage given by the equation: V-0.0022Q2 Where Q is the flow rate in m/h Develop the signal conditioning circuitry and ADC interface that will satisfy this requirement What is the resolution of the flow rate at the lower limit and at the uppe limit? Are they the same? Explain your results. a. b.

Explanation / Answer

From ADC specifications,

Sampling frequency can be calculated as,

F= 1/ (2^10 X 44 us) = 22.19 HZ.

Time= 45 ms .

So, time constant should be matching this time

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