Design the ADC interface to a

Design the ADC interface to a digital thermostat using an LM34 temperature sensor and the ADC0804. Your system must measure accurately 1{0.2°F2 from 60°F to 101°F. The LM34 puts out 0.01 V per degree F 10°F = 0V2.

(a) What should the digital value for 60°F be for the best resolution?

(b) What voltage must be applied to VIN1-2?

(c) What is the full-scale range of voltage that will come in?

(d) What voltage must be applied to VREF/2?

(e) What binary value will represent 84°F?

(f) What is the resolution in °F? In volts?

 

Draw the circuit diagram for a four-bit flash converter with BCD output and a resolution of 0.1 V. Assume that a +5V precision supply voltage is available.

 

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