op amp summer as a digital to analog converter dac

Posted on Feb 6, 2014

The circuit shown in Figure 1 is a simple 4-bit digital-to-analog converter. It is actually just a simple op amp summer circuit, i. e. , an operational amplifier configured to output a voltage that is proportional to the sum of the input voltages. The op-amp summer circuit above works as a DAC because its input voltages are binary weighted with resp

op amp summer as a digital to analog converter dac
Click here to download the full size of the above Circuit.

ect to each other, as set by the resistors (10K, 20K, 40K, 80K) at the inputs. Vo = -VRef (5K) (S3/10K + S2/20K + S1/40K + S0/80K) = -VRef (S3/2 + S2/4 + S1/8 + S0/16) wherein S3, S2, S1, and S0 are the logic inputs (`1` or `0`). The number of bits of this DAC may be increased by connecting more switches with corresponding binary-weighted resistors to the inputs.

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