ecel303_lab5se

ecel303_lab5se - Drexel University Electrical and Computer...

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Drexel University Electrical and Computer Engineering Dept. Electrical Engineering Laboratory III, ECEL-303 TITLE: Digital-to-Analog Conversion NAME: Seher Ahmad PARTNERS: Palak Chandra TA: Nicholas Vacirca DATE PERFORMED: 4 May th , 2007 DATE DUE: 11 rth May, 2007

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Digital-to-Analog Conversion Aim : The aim of this experiment is to learn about digital to analog conversion. Basic operation of a D/A system will be covered and a simple IC device will be investigated. Circuit Diagrams Figure 1: Performed by Seher Ahmad and Palak Chandra on 11/04/07 Vcc = 4.9958 V, Vee = -14.7 V, Vled = 3.2 V
Data and Calculations Part 2 of the experiment involved reading the output of the ADC/DAC system when the input was shorted (0 volts). This voltage should be extremely close to zero. V o = -1.3 mV Part 3a consisted of sweeping the DC input voltage from 1 to 5 volts in 1-volt increments while measuring the output voltage. Vin (V) 0 1 2 3 4 5 Vout(V) -0.00013 -1.03 -2.02 -3.02 -3.96 -4.56 Figure 2: Vin and Vo for DC Sweep with All Switches Closed Performed by Seher Ahmad and Palak Chandra on 11/04/07 Part 3b demonstrates what happens when various bits are switched on and off when the input is 1 volt. Figure 3 shows the LED output when the input is 1 volt. Figure 3: Led when Vin- 1V Performed by Seher Ahmad and Palak Chandra on 11/04/07

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Switch Open None 0 (LSB) 2 4 6 7(MSB) Vout(V) -1.02 -1.045 -1.057 -1.175 -2.289 -3.526 Figure 4: Vout with switches open and Vin 1V Performed by Seher Ahmad and Palak Chandra on 11/04/07 When all switches are open, the output voltage is very close to, but opposite in polarity, the input voltage. When switch 0, the LSB, is turned off, the output voltage is slightly
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This note was uploaded on 12/02/2011 for the course ECEL 353 taught by Professor Gerber during the Spring '11 term at Hanoi University of Technology.

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ecel303_lab5se - Drexel University Electrical and Computer...

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