Fawad,
If you only need the two choices of 1.5V and 0V to control the AFE5809 attenuator, it is acceptable to just use single-ended potentials of 0V and 1.5V on the VCNTLP pin while VCNTLM is grounded. In this case 1.5V sets the attenuator to maximum attenuation and 0V sets it to minimum attenuation.
