DigitaltoAnalog & AnalogtoDigital Conversion. BJ Furman 17APR2014. DAC and ADC. DigitaltoAnalog Conversion (DAC) Converts a binary value to a scaled ‘analog’ voltage Used for controlling systems that require an analog input. DC servo motor Resistive heater, etc.
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DigitaltoAnalog & AnalogtoDigital Conversion
BJ Furman
17APR2014
R
R
R
2R
Vref
c
d
a
b
2R
2R
2R
2R
MSB
LSB
bit 3
bit 2
bit 1
bit 0
R
Vout

+
What are the voltages at nodes a  d?
“switches”
Develop a general expression for Vout
Use the general expression to determine Voutif the switch associated with bit 2 is connected to the amplifier.
http://upload.wikimedia.org/wikipedia/en/6/61/SA_ADC_block_diagram.png
Stiffler, A.K. (1992). Design with microprocessors for mechanical engineers. McGrawHill, NY.
From Necsulescu, D., (2002). Mechatronics, PrenticeHall, New Jersey.
Source: ATmega328 data sheet, p. 251