circuit analysis lab experiment report, Lecture notes of Electronic Circuits Design

Download circuit analysis lab experiment report and more Lecture notes Electronic Circuits Design in PDF only on Docsity! ESKISEHIR OSMANGAZI UNIVERSITY ELECTRICAL AND ELECTRONICS ENGINEERING 2020-2021 SPRING SEMESTER DIGITAL SYSTEMS LABORATORY EXPERIMENT 6 DIGITAL TO ANALOG CONVERSION MERVE AKSU, 151220184081 GROUP II- A ESKISEHIR OSMANGAZI UNIVERSITY EEE ELECTRICAL AND ELECTRONICS ENGINEERING EXPERIMENT 6 REPORT OBJECTIVES ¢ Understanding how and for what purpose DAC0808 is used. ¢ Learning how to convert digital input to analog output. INTRODUCTION DACO0808 is aD / A converter IC and used to convert 8-bit digital data input to analog signal output. The power supply currents of the DACO808 are independent of bit codes and exhibit essentially constant device characteristics over the entire supply voltage range. DAC0808 IC is used in applications where digital to analog conversion is required. The chip was popular ten years ago and its applications were many, but now there are many modern ICs that can perform DAC with higher resolution, speed and efficiency, so this device is mainly used for reference and starting applications and nothing more. DAC enabled microcontroller or serial interface DAC IC is currently preferred for advanced applications. Pin Name Description 1 Nc No connection 2 GND Ground 3. VEE Negative power supply 4 10 Output signal pin 5 Al Digital input bit 1 (Most Significant Bit) 6 A2 Digital input bit 2 7 A3 Digital input bit 3 8 A4 Digital input bit 4 9 AS Digital input bit 5 10 A6 Digital input bit 6 11 A7 Digital input bit 7 12 A8 Digital input bit 8 (Least Significant Bit) 13, VCC Positive power supply 14. VREF+ Positive reference voltage 15 VREF- Negative reference voltage 16 COMPENSATION Compensation capacitor pin Digital Systems Laboratory, 2021 DIGITAL INPUTS: Dacoses SERIES “VREF Figure 1 Table 1. DIGITAL INPUT ANALOG OUTPUT BINARY VREF=10V VREF=5V 00000000 0.00 0.00 11111111 -11.7 -11.7 10000000 -11.6 -10.00 01000000 -6.25 -5.00 00100000 -3.12 -2.50 00000001 -0.09 -0.07 00110011 -4.98 -3.98 01010001 -7.91 -6.33 10000001 -11.6 -10.1 00010000 -1.56 -1.25 Note: You will fill the table with analog outputs firstly. And you will add your simulation program output photos for the cells containing (Add photo) text. Digital Systems Laboratory, 2021 ww eee i= = z= VREF+ lout 4swe + stl WESFOT. A sw * Psat tere eet SPOT COMP For Vref=5V, DI=I 1111111. For Vref=5V, DI=0 1000000. Digital Systems Laboratory, 2021 eat “VREF+ tour AT comp DACHOS |), bee ai 5 4 q i MALSFOT ee MLSFOT SWS Pesta For Vref=5V, DI=-0000001. ty Bala At VREF+ lout = lar come 28 VEE SW5 DACasG8 1 ts 15 TLSEDT 4 swe Prasat al Lo swsrot ‘ swe is Suseor For Vref=5V, DI=0 1010001. Digital Systems Laboratory, 2021 a T eo SW3 = = Piccecr —_ ut cE slat veers zal #2 pet a3 VRE. s He Bier Sern SF Sear coMe AB VEE 4 SWS DACOSOS | Lag = Wi-SFOT ows t Leivceor For Vref=10V, DI=00 110011. swt Peete tar { te WREFY VREF- 1ouT a0 aT comp a8 toe ||P ee tayo t Swe ere Pieces = For Vref=10V, DI-10000001. Digital Systems Laboratory, 2021 DISCUSSION AND CONCLUSIONS In this experiment, it was observed how dac0808 converts digital input to analog output in the proteus environment. The circuit in the Figure 1. has been set up and power has been connected to the A pins with the switch. DC voltmeter was used to measure the output voltage. Procedure 1- The circuit given in Figure | is set up. Selected R14=R15=RL=4.7 Kohm, C=100 nF. Also digital inputs to the switches on the training set are connected. Procedure 2- VEE is set -15V. Procedure 3- Vref is set 5V. Procedure 4- By using DC voltmeter, the corresponding output voltages for the digital input values given in table 1 is measured and reflected to it. Procedure 5- Vref is set 10V and repeated Step 4. Thus, it was understood which analog signal the inputs entered together with the reference voltage value correspond to. However, slight differences were observed between the actual experimental environment and the measurements in the proteus environment. this was assumed to be because measurement with a real circuit may yield results different from ideal. Sometimes it happens that ideal results are not obtained in the proteus, but it is mostly ideal. In addition, it was observed that the Ist, 2nd and 13th pins of dac0808 in the proteus were absent. The Ist pin should be ignored since it is NC, no connection pin, and nothing will be connected anyway. Since the 2nd and 13th pins are GND and VCC pins, these pins are ignored in the proteus, because a crowded circuit is not required and for convenience, so these values are already given. Digital Systems Laboratory, 2021