Q. An 8-bit weighted resistor digital-to-analog converter (DAC) has the smallest resistance of 500 Ω. The largest resistance has a value
Sol:
In general, in a binary weighted resistor DAC, the relationship between LSB and MSB resistance is given as :
LSB Resistance =(2n−1) MSB resistance where, n is the number of bits in the DAC.
Given, n=8
smallest resistance =500Ω
MSB resistance =500Ω
∴LSB resistance =(28−1)×500Ω
=128×500Ω
=64000Ω=64kΩ
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