The DAC shown in figure below has step size 0.5 V. Find the value

The DAC shown in figure below has step size 0.5 V. Find the value
| The DAC shown in figure below has step size 0.5 V. Find the value of feedback resistance RF.

A. 800 Ω

B. 500 Ω

C. 200 Ω

D. 600 Ω

Please scroll down to see the correct answer and solution guide.

Right Answer is: A

SOLUTION

For weight-resistor type DAC, the LSB is amplified by RF/8k. The step size is equivalent to output voltage corresponding to LSB input. So, we get

Or RF = 800 Ω

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