Techniques are provided for producing two output voltages that are substantially symmetric about a middle voltage (VCOM), based on a digital data value stored in a register. A first output voltage is produced based on the digital data value stored in the register. Additionally, the digital data value stored in the register is converted (e.g., by determining its 2's compliment) to a second digital data value, which is used to produce a second output voltage that is substantially symmetric about VCOM with the first output voltage. Alternatively, the digital data value stored in the register is provided to two different DACs that have their pair of reference voltages swapped (where the reference voltages are symmetric about VCOM), which will result in the outputs of the DACs being substantially symmetric about VCOM.