Digital to Analog Converters - R-2R Ladder DAC | Linear Integrated Circuits : Analog to Digital And Digital to Analog Converters
Chapter: Linear Integrated Circuits : Analog to Digital And Digital to Analog Converters
R-2R Ladder DAC
An enhancement of the binary-weighted resistor DAC is the R-2R ladder network.
R-2R
Ladder DAC
An
enhancement of the binary-weighted resistor DAC is the R-2R ladder network. This
type of DAC utilizes Thevenin’s theorem in arriving at the desired output
voltages.
A
disadvantage of the former DAC design was its requirement of several different
precise input resistor values: one unique value per binary input bit.
The
R-2R network consists of resistors with only two values - R and 2xR. If each
input is supplied either 0 volts or reference voltage, the output voltage will
be an analog equivalent of the binary value of the three bits. VS2
corresponds to the most significant bit (MSB) while VS0 corresponds to the
least significant bit (LSB).
Vout
= - (VMSB + Vn + VLSB)
= - (VRef + VRef/2 + VRef/ 4)
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Linear Integrated Circuits : Analog to Digital And Digital to Analog Converters