Answer:

1. The above figure shows the circuit diagram of a R - 2R Ladder type DAC. The circuit is relatively simple with only two resistor values, R & 2R
2. The best possible values for R must be from the range of$2.7 \ \text{K}\Omega$ to$10 \ \text{K}\Omega$.
3. Op - amp is connected as a current to voltage converter

Operation:

Assuming that there is a digital input of 100, we will now analyze the circuit

We see that resistors 2R and 2R are in parrallel, which gives us the value R

Now, resistors R and R are in series which gives us 2R