Step3 - waveform as you increase the frequency through the...

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ECEL304 ECE Laboratory IV Winter 06-07 Dr. Fontecchio Step 3. Build the DAC Circuit PreLab Read the DAC0808 data sheet. Pay particular attention to Figure 1. This Figure is used to implement the DAC circuit. Tasks Build and characterize a digital to analog converter Place the DAC circuit components on your board (consult data sheet and board schematic). Use the output of your ADC as input to the DAC. Drive the ADC with the same 10 Hz ramp voltage (0 to 5 V ramp, 10 Hz frequency) as used in Step 2. Observe analog input on one scope channel, and the analog output on another. Capture this scope output. Measure the width in time of one segment ( Δ t) of the DAC output. How does this time compare to the pin period? Figure 1. Discrete voltage levels at the output of a DAC Change the function generator output to a sinewave with 5 V pp , 2.5 V dc offset, and 10 Hz frequency to start. Observe characteristics of the output
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Unformatted text preview: waveform as you increase the frequency through the audio range (to 10 kHz). At what frequency does the system fail? Capture the scope output at failure, indicating the input frequency on the capture. How does the input period at failure compare to the time required for your circuit to make an ADC measurement? Deliverables • Have your TA verify circuit functionality, especially the scope waveforms comparing input to output • Short introduction • Sketch your test circuit(s) • List all components being used in your ADC and DAC circuits • Discuss your measurements and screen captures, making sure you have answered all of the questions above. Describe the condition of minimum sampling frequency and how this relates to the operation of your ADC with the current values of R and C in the internal clock circuit. • Short conclusions...
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