Q) Assume that you have an 8-bit ADC with Vref = 5V. If the input voltage is 3.5V, what is the resulting code word?
Q) Assume that you have an 8-bit ADC with Vref
= 5V. If the input voltage is 3.5V, what
is the resulting code word?
Homework Answers
The size of the step is given by:
Vref/256
where Vrefis the reference voltage. The step size of the converter defines the converter's resolution. For a 5V reference, the step size is:
5V/256 = 0.0195V or 19.5mV
| Bit: | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
| Volts: | 2.5 | 1.25 | 0.625 | 0.3125 | 0.156 | 0.078 | 0.039 | 0.0195 |
| Output Value: | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
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Q) Assume that you have an 8-bit ADC with Vref = 5V. If the input voltage is 3.5V, what is the resulting code word?
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ADC, DAC Equations ADC: Vin input voltage, Vreft= reference voltage, Vref- N=number of bits of precision 0 V Vin/Vref output code/ 2N 2N output code Vref Vin Vref/2N 1 LSB DAC: Vout output voltage, Vref= reference voltage, N number of bits of precision 2Ninput code Vref Vout Vout/ Vref input_code/ 2N nn nun enhuu nnde Vref/2N 1 LSB Question 3 If Vref 5V, and a 8-bit A/D output code is OXFF, what is the ADC input voltage? If Vref 4V,...
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8 bit, with a 3V reference and 0V offset. What is the resolution,
expressed in millivolts? [2]
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value of the ADC described in (a)? Express your answer in both
binary and hexadecimal. [3]
(c) An industrial oven has a thermometer that outputs a voltage
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(cell) = 1, and if it does not turn on then the cell is worth 0. If
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