8.2.1.2 Detailed Design Procedure

The DAC7811 output current is converted into a voltage by including an op-amp in a transimpedance configuration at the DAC7811 current output terminal. The transimpedance stage creates an output voltage with opposite polarity to that of VREF and subsequently requires dual supplies. This circuit removes the need of dual power supplies and uses a single supply to power the circuit.

The transfer function from digital code to output voltage is shown in Equation 5.

Equation 5.

More information regarding this design can be found in Single-Supply Unipolar Multiplying DAC Reference Design (TIDU300).