NI 2002DA converter

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NI 2002-D/A converter

• Group 1
• David McCauley
• Daniel Gunn
• Sydney Ackerman

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Project Description

• The objective of this project is to use LabView
  to test a circuit and to compare the results with
  theoretical values and values obtained using
  discrete pieces of equipment.
• Circuit
• D/A converter with 4-bit TTL and 1 volt
  output resolution using commonly available
  operational amplifiers.

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D/A Converter

• A Digital to Analog converter, converts
  information in digital form to analog form.
• Both the digital information and the analog
  information represents the same data but differ
  in form that the information is saved and
  presented.

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Theoretical Analysis

• INPUTS OUTPUTS

1 2 3 4
0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0
1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1
0 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 1
0 0 1 1 0 1 1 1 1 0 1 1 1 1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Instruments

• Oscilloscope- checks to make sure voltages match
  up on output
• Voltmeter- checks specific voltages across
  circuit
• Function Generator- provides input clock to
  counter
• Power Supplies supply power to circuit
• Spectrum Analyzer- checks signal to noise ratio

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PSpice Schematic
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Whole circuit
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Counter
COUNTER
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Inputs
80K
40K
20K
10K
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Op Amps Output
Output OPAMP 1
Output OPAMP 2
OP AMP 1
OP AMP 2
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Voltmeter Analysis
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Analytical Voltmeter Analysis
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0000 0001 0010 0011 0100
0101 0110 0111 1000 1001
1010 1011 1100 1101 1110 1111
14
0000 0001 0010 0011 0100
0101 0110 0111 1000 1001
1010 1011 1100 1101 1110 1111
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Oscilloscope
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Digital Voltmeter
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0000 0001 0010 0011 0100
0101 0110 0111 1000 1001
1010 1011 1100 1101 1110 1111
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Elvis Oscilloscope
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Elvis Spectrum Analyzer
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Labview vs Analytical Voltmeter
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Elvis Problems

• Oscilloscope only takes input up to 10V
• No variable supplies go over 15V
• Blown fuses

Solutions

• Step down output within circuit
• Use external power supplies

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Gantt Chart
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Gantt Chart Cont.
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Revised Budget-Time

• week 1   11hrs for 3 people _at_ 10/hr
• week 2  15hrs for 3 people _at_ 10/hr
• week 3  14hrs for 3 people _at_ 10/hr
• week 4  15hrs for 3 people _at_ 10/hr
• Week 5 12hrs for 3 people _at_ 10/hr
• Overhead   67total hrs 3 people 10/hr .75
• TOTAL 3517.50

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Revised Budget-Supplies

• 10 resistors _at_ approx. 20 cents each
• 4 op amp _at_ approx. 99 cents
• 1 breadboard _at_ approx. 10
• 1 Counter _at_ approx. 1.50
• 1 Switch _at_ approx. 3.30
• Oscilloscope - 2 days _at_ 1400/day .002
• Voltmeter - 10 days _at_ 259/day .002
• Banana Clips(9)- 10 days _at_ 12/day.002
• Function Generator - 4 days _at_ 500/day .002
• Power Supplies(3) 10 days _at_ 211.75/day .002
• Spectrum Analyzer - 1 days _at_ 5,000 /day.002
• TOTAL 60.40
• OVERALL TOTAL 3577.90

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We know that we are done because

• Circuit is monotonic
• Output is linear
• Labview analysis proportional to Analytical
  Analysis
• Minimized THD to the best of our abilities

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References

• Simplified Design Of Data Converters by John D.
  Lenk
• http//www.maximic.com/appnotes.cfm/appnote_number
  /641
• http//www.epanorama.net/documents/audio/signal_to
  _noise.html
• http//www.es.isy.liu.se/publications/presentation
  s/download/present.EDA.apr.00.jjw.pdf
• http//www.elecdesign.com/Articles/Index.cfm?Artic
  leID7655pg2
• http//en.wikipedia.org/wiki/Signal-to-noise_ratio
  
• Dr. Krile
• Dr. Storrs
• Dr. Mankowski

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Questions

• ?