DAC Supply Voltage | Amplifier Supply Voltage | DAC Voltage | Output Voltage | Error |
---|---|---|---|---|
5V | ±15V | 0V–2.5V | ±10V | <0.25% FSR |
The unipolar to bipolar output voltage circuit converts the voltage from a unipolar DAC into a bipolar voltage span. The circuit consists of a DAC, op amp, voltage reference, and three resistors to set the scale and span of the bipolar output voltage. This circuit is commonly used in Analog output module, Field Transmitters, and other applications requiring a programmable bipolar voltage.
Design Steps
1. The voltage output based on DAC voltage, reference voltage, and resistors is given by:
2. Set the DAC voltage to zero to calculate ratio of RFB and RG1 to create the desired negative full-scale output. Select standard resistor values to produce this gain.
3. Calculate RG2 based on the full-scale range required, in this case 20V to produce ±10V range.
4. The output error can be approximated based on DAC TUE, amplifier offset voltage, resistor tolerance, and reference initial accuracy using root sum square (RSS) analysis.
Texas Instruments, Bipolar ±10V Output from a Unipolar DAC for Industrial Voltage Drivers, TIPD125 tool
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