DC relay with 2.5V coil voltage and contact voltage of +12V and -12V
You most likely cannot operate the relay directly from the output of the LTC6994 so you may as well operate the coil from the incoming +12V making it a much more standard and widely available 12VDC coil DPDT or DPST relay. 

Use a transistor. The relay type will depend on the current you are switching and you may have issues if you have a lot of capacitance on the switched side, but that's outside of what I shall presume to be the scope of this question. 

If you have a relay coil current up to ~150mA at 12V, you can use a simple circuit such as this: 







simulate this circuit &ndash; Schematic created using CircuitLab