R 2r Ladder Dac Circuit Diagram

Now for understanding satasheet working let us consider the example application circuit given in the datasheet.

R 2r ladder dac circuit diagram. By alan wolke with the recent announcement of the world s fastest digital to analog converter dac from tektronix component solutions i thought it would be interesting to take a quick tutorial tour through one of the simplest dac architectures the r 2r resistor ladder network as shown in figure 1below. The following circuit diagram shows the basic 2 bit r 2r ladder dac circuit using op amp. Dac also designed with silicon chromium r 2r resistor ladder network which divides the reference current and provides the circuit with excellent temperature tracking characteristics 0. R 2r ladder dac by using the r 2r ladder network this type of dac is designed.

R 2r ladder digital to analog converter dac the above figure shows the 4 bit r 2r ladder dac. The r 2r dac circuit is an alternative to the binary weighted input r 2nr dac which uses fewer unique resistor values. The circuit diagram of a 3 bit r 2r ladder dac when binary input b 2 b 1 b 0 100 applied to it is shown in the following figure in the above circuit there exists series and parallel combinations of resistors to the left of point a with respect to ground. One unique value per binary input bit.

The r 2r resistor ladder network directly converts. In order to achieve high level accuracy we have chosen the resistor values as r and 2r. A disadvantage of the former dac design was its requirement of several different precise input resistor values. The r 2r resistor ladder based digital to analog converter dac is a simple effective accurate and inexpensive way to create analog voltages from digital values.

Let the binary value b3 b2 b1 b0 if b3 1 b2 b1 b0 0 then the circuit is shown in the figure below it is a simplified form of the above dac circuit. The switch positions decides the binary word i e. By using superposition theorem we can find in any n bit ladder network the. Now at n4 if we calculate the output analog equivalent voltage then we will get.

What it is and why you need one so what is an r 2r ladder. As this dac is using only two types of the resistor r and 2r it has certain advantages over binary weighted. A 4 bit r 2r network. The number of digits per binary word is assumed to be two i e.

Well it is just a cleverly arranged set of resistors that gives you the unique action of turning binary signals into an analogue output voltage. Here only two values of resistors are required i e. Thus when bit 1000 the output is v r 2. It works by the principle of superposition where switching on binary inputs adds more voltage at the output.