# Design an 8-Bit DAC Circuit ? Calculate the values for all resistors

February 8, 2018
###### Compare/Contrast · Treaties vs. Executive Agreements
February 9, 2018

Interfacing a Transducer to an Analog-to-Digital Converter and Interfacing Digital-to-Analog Converters to Loads
Watch video Week 5 Op Amp DAC Circuit (Right click, save as)
Design an 8-Bit DAC Circuit Calculate the values for all resistors
Include calculations and schematic in a Word document entitled: HW5_StudentID , with your student id substituted in the file name. Show all work for full credit.
Complete circuit in multisim!

Lab
Interfacing a Transducer to an Analog-to-Digital Converter and Interfacing Digital-to-Analog Converters to Loads
The purpose of this lab is to allow students to gain experience constructing Digital to Analog Converters in Multisim. Students will extend the concepts learned in the module and homework to build an 8-Bit DAC. Several binary inputs and the associated analog output values measured with a virtual digital multimeter will be captured in screenshots.
Watch the video Week 5 Op Amp DAC Circuit
Determine the values of all the remaining seven resistors and fill in the table 1.
Table1:
Resistors Values
R1 1k
R2
R3
R4
R5
R6
R7
R8
Recall the binary to decimal conversion and fill the table below:
Bits Binary Input Decimal conversion
MSB
(S1)
1000 0000
S2
S3
S4
S5
S6
S7
LSB
(S8)
0000 0001
Construct an 8-bit binary weighted DAC in Multisim and measure the output voltage Vout using the multimeter and record the computed gain below.
Table2:
Bits Binary Input Vin Rn
(n = 1,2,3,4,5,6,7,8)
RF Output Voltage (Vout) Voltage Gain (Av)
MSB
(S1)
1000 0000
S2
S3
S4
S5
S6
S7
LSB
(S8)
0000 0001
Take the screenshots of Vout measurements for the input/output combination for each of the above 8-bits.