Inverted R-2R Ladder Digital to Analog Converter.pptx

This power point explains about Inverted R-2R Ladder Digital to Analog Converter

1. INVERTED R-2R LADDER DAC

2. Why we use inverted r-2r ladder DAC? Current flowing in weighted register DAC varying. It causes large power dissipation. It produces heating and causes non linearity in current flowing through resistors. To overcome these disadvantage we use inverted r-2r ladder DAC.

3. Circuit Diagram

4. Working MSB and LSB are interchanged. Binary input datas are connected to switch either to ground or to the inverting input terminal of the op-amp which is at the virtual ground. 0 - switch connected to ground. 1 - switch connected to virtual ground. The current flowing through resistors constant. In each node,current dvides equally. Because the resistance value is equal in botha right and left side of each node. Thus the constant current implies constant voltage across each node.

5. To find Io :

6. THANK YOU