Lab report 5 - TITLE: LAB-5: Digital-to-Analog Conversion...

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Unformatted text preview: TITLE: LAB-5: Digital-to-Analog Conversion NAME: RAVNEET KAUR SECTION: 062 PARTNER: SAIMANI KUMAR M.N.V TA: Kaloyan Popov DATE PERFORMED: 23 rd Oct 2009 DATE DUE: 30 th Oct 2009 DATE RECEIVED: Objective: The object 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. We have to observe the digital input and the analog output by switching on and off the different switches. Circuit Diagrams & Schematics: The DC power supply V CC = +5.0 V is connected to the ADC-DAC circuit board. The power of the ADC-DAC board is then switched on. The Digital-to-analog Conversion (DAC) 0808 chip pin numbers is shown below (Fig. 1): Fig. 1: The pin numbers of the Digital-to-Analog Converter Chip (DAC0808) Performed by Saimani and Ravneet on 23 rd October 2009 The DAC-DAC circuit board is shown below (Fig. 2): Fig. 2: The schematic diagram of the Analog-Digital Conversion and Digital-Analog Conversion Board (DAC-DAC) Performed by Saimani and Ravneet on 23 rd October 2009 The equivalent circuit of the DAC 080 chip is shown below (Fig. 3): Fig. 3: The equivalent circuit of the DAC 080 chip Performed by Saimani and Ravneet on 23 rd October 2009 The DAC 0808 circuit connection is shown below (See Fig. 4): Fig. 4: The DAC 0808 circuit connection Performed by Saimani and Ravneet on 23 rd October 2009 Data Sheet: 1) ADC-DAC Board Set-up : A +5.0V DC supply is connected to the ADC-DAC circuit board as seen in Fig. 2. The actual measured DC voltage between V CC and ground for the ADC chip 0804 is +5.001 V and for the DAC chip 0808, the actual measured DC voltage between V CC and ground is +4.9876 V. The voltage of the LEDs is measured using the multimeter to be 3.1843 V and the V EE at pin 3 is found to be -14.91 V . The actual value of LEDs voltage is + 5.0 V and VEE is -15 V . The output lines from the ADC chip are used as inputs to the DAC chip. This connection is made internally through the eight switches visible on the circuit board. 2) Zero Input Test: The input terminals are shorted with the result that the input to the ADC chip is zero. All the eight LEDs are lit and since the LEDs are inverted the output is inverted. This means that the output is actually logic zero. On being measured using a multimeter, the analog output voltage of the DAC chip 0808 is found to be -2.163 mV . The expected value of analog voltage of output for logic zero is 0 V . 3) AD/DA- DC Test : The input voltage is varied at 0.0 V, 1.0 V, 2.0 V, 3.0 V, 4.0 V and 5.0 V and the analog output voltages are measured at each input voltage and are tabulated: Input Voltage, volts Output Voltage, volts-0.0022 1-1.0230 2-2.0220 3-3.0250 4-3.9670 5-4.5802 Table 1: The output voltages obtained when the input voltages are varied Performed by Saimani and Ravneet on 23 rd October 2009 Next, the input voltage is set at +1.0 V and the output of the DAC is measured and is found to be -1.023 V. Since the LEDs are inverted, the actual analog voltage is 1.023 V which is Since the LEDs are inverted, the actual analog voltage is 1....
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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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Lab report 5 - TITLE: LAB-5: Digital-to-Analog Conversion...

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